Hey guys, 
my problem is, when I switch from MTA to desktop and then back to MTA, the game crashes. I've already tried to reinstall MTA and GTA, to delete gta_sa.set and to downgrade gta_sa.exe. 
MTA Crashlog 
 
  
Version = 1.4.1-release-7161.0.000 
Time = Sun Apr 05 01:55:27 2015 
Module = C:\Windows\system32\nvd3dum.dll 
Code = 0xC0000005 
Offset = 0x00648F0C 
  
EAX=00000000  EBX=00000001  ECX=00000000  EDX=00000029  ESI=01C9E540 
EDI=01C75800  EBP=0429F230  ESP=0429F210  EIP=64998F0C  FLG=00010206 
CS=0023   DS=002B  SS=002B  ES=002B   FS=0053  GS=002B 
  
 
DxDiag 
 
   ------------------  System Information  ------------------  Time of this report: 4/5/2015, 01:38:53         Machine name: XXXXXXXX     Operating System: Windows 7 Ultimate 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.150202-1526)             Language: German (Regional Setting: German)  System Manufacturer: To Be Filled By O.E.M.         System Model: To Be Filled By O.E.M.                 BIOS: BIOS Date: 04/21/11 16:14:20 Ver: 04.06.04            Processor: Intel(R) Core(TM) i3-2120T CPU @ 2.60GHz (4 CPUs), ~2.6GHz               Memory: 8192MB RAM  Available OS Memory: 8174MB RAM            Page File: 3718MB used, 12628MB available          Windows Dir: C:\Windows      DirectX Version: DirectX 11  DX Setup Parameters: Not found     User DPI Setting: 96 DPI (100 percent)   System DPI Setting: 96 DPI (100 percent)      DWM DPI Scaling: Disabled       DxDiag Version: 6.01.7601.17514 32bit Unicode     ------------  DxDiag Notes  ------------        Display Tab 1: No problems found.          Sound Tab 1: No problems found.            Input Tab: No problems found.     --------------------  DirectX Debug Levels  --------------------  Direct3D:    0/4 (retail)  DirectDraw:  0/4 (retail)  DirectInput: 0/5 (retail)  DirectMusic: 0/5 (retail)  DirectPlay:  0/9 (retail)  DirectSound: 0/5 (retail)  DirectShow:  0/6 (retail)     ---------------  Display Devices  ---------------            Card name: NVIDIA GeForce GTX 550 Ti         Manufacturer: NVIDIA            Chip type: GeForce GTX 550 Ti             DAC type: Integrated RAMDAC           Device Key: Enum\PCI\VEN_10DE&DEV_1244&SUBSYS_00000000&REV_A1       Display Memory: 4048 MB     Dedicated Memory: 1488 MB        Shared Memory: 2559 MB         Current Mode: 1920 x 1080 (32 bit) (60Hz)         Monitor Name: AOC V22        Monitor Model: F22           Monitor Id: AOC2200          Native Mode: 1920 x 1080(p) (60.000Hz)          Output Type: HD15          Driver Name: nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll,nvd3dum,nvwgf2um,nvwgf2um  Driver File Version: 9.18.0013.4411 (English)       Driver Version: 9.18.13.4411          DDI Version: 11         Driver Model: WDDM 1.1    Driver Attributes: Final Retail     Driver Date/Size: 9/14/2014 01:48:03, 19954520 bytes          WHQL Logo'd: Yes      WHQL Date Stamp:     Device Identifier: {D7B71E3E-5104-11CF-8B72-0D201CC2C435}            Vendor ID: 0x10DE            Device ID: 0x1244            SubSys ID: 0x00000000          Revision ID: 0x00A1   Driver Strong Name: oem52.inf:NVIDIA_SetA_Devices.NTamd64.6.1:Section002:9.18.13.4411:pci\ven_10de&dev_1244       Rank Of Driver: 00E00003          Video Accel: ModeMPEG2_A ModeMPEG2_C ModeVC1_C ModeWMV9_C      Deinterlace Caps: {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive                        {F9F19DA5-3B09-4B2F-9D89-C64753E3EAAB}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY                        {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY                        {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch                        {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(UYVY,UYVY) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive                        {F9F19DA5-3B09-4B2F-9D89-C64753E3EAAB}: Format(In/Out)=(UYVY,UYVY) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY                        {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(UYVY,UYVY) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY                        {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(UYVY,UYVY) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch                        {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(YV12,0x32315659) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive                        {F9F19DA5-3B09-4B2F-9D89-C64753E3EAAB}: Format(In/Out)=(YV12,0x32315659) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY                        {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(YV12,0x32315659) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY                        {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YV12,0x32315659) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch                        {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive                        {F9F19DA5-3B09-4B2F-9D89-C64753E3EAAB}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY                        {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY                        {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch                        {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(IMC1,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {F9F19DA5-3B09-4B2F-9D89-C64753E3EAAB}: Format(In/Out)=(IMC1,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(IMC1,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(IMC1,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(IMC2,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {F9F19DA5-3B09-4B2F-9D89-C64753E3EAAB}: Format(In/Out)=(IMC2,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(IMC2,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(IMC2,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(IMC3,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {F9F19DA5-3B09-4B2F-9D89-C64753E3EAAB}: Format(In/Out)=(IMC3,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(IMC3,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(IMC3,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(IMC4,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {F9F19DA5-3B09-4B2F-9D89-C64753E3EAAB}: Format(In/Out)=(IMC4,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(IMC4,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(IMC4,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(S340,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {F9F19DA5-3B09-4B2F-9D89-C64753E3EAAB}: Format(In/Out)=(S340,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(S340,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(S340,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(S342,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {F9F19DA5-3B09-4B2F-9D89-C64753E3EAAB}: Format(In/Out)=(S342,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(S342,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=                       {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(S342,UNKNOWN) Frames(Prev/Fwd/Back)=(0,0,0) Caps=         D3D9 Overlay: Supported              DXVA-HD: Supported         DDraw Status: Enabled           D3D Status: Enabled           AGP Status: Enabled     -------------  Sound Devices  -------------              Description: Lautsprecher (3- Logitech G930 Headset)   Default Sound Playback: Yes   Default Voice Playback: Yes              Hardware ID: USB\VID_046D&PID_0A1F&REV_0100&MI_00          Manufacturer ID: 65535               Product ID: 65535                     Type: WDM              Driver Name: USBAUDIO.sys           Driver Version: 6.01.7601.18208 (English)        Driver Attributes: Final Retail              WHQL Logo'd: Yes            Date and Size: 7/12/2013 12:40:58, 109824 bytes              Other Files:           Driver Provider: Logitech, Inc.           HW Accel Level: Basic                Cap Flags: 0xF1F      Min/Max Sample Rate: 100, 200000  Static/Strm HW Mix Bufs: 1, 0   Static/Strm HW 3D Bufs: 0, 0                HW Memory: 0         Voice Management: No   EAX(tm) 2.0 Listen/Src: No, No     I3DL2(tm) Listen/Src: No, No  Sensaura(tm) ZoomFX(tm): No     ---------------------  Sound Capture Devices  ---------------------              Description: Mikrofon (3- Logitech G930 Headset)    Default Sound Capture: Yes    Default Voice Capture: Yes              Driver Name: USBAUDIO.sys           Driver Version: 6.01.7601.18208 (English)        Driver Attributes: Final Retail            Date and Size: 7/12/2013 12:40:58, 109824 bytes                Cap Flags: 0x1             Format Flags: 0xFFFFF                 Description: Stereomix (VIA High Definition Audio)    Default Sound Capture: No    Default Voice Capture: No              Driver Name: viahduaa.sys           Driver Version: 6.00.0001.9400 (English)        Driver Attributes: Final Retail            Date and Size: 2/17/2011 16:51:06, 2153072 bytes                Cap Flags: 0x1             Format Flags: 0xFFFFF     -------------------  DirectInput Devices  -------------------        Device Name: Maus           Attached: 1      Controller ID: n/a  Vendor/Product ID: n/a          FF Driver: n/a           Device Name: Tastatur           Attached: 1      Controller ID: n/a  Vendor/Product ID: n/a          FF Driver: n/a           Device Name: Audio Controls           Attached: 1      Controller ID: 0x0  Vendor/Product ID: 0x046D, 0x0A1F          FF Driver: n/a           Device Name: USB Receiver           Attached: 1      Controller ID: 0x0  Vendor/Product ID: 0x046D, 0xC52E          FF Driver: n/a           Device Name: USB Receiver           Attached: 1      Controller ID: 0x0  Vendor/Product ID: 0x046D, 0xC52E          FF Driver: n/a           Device Name: USB Receiver           Attached: 1      Controller ID: 0x0  Vendor/Product ID: 0x046D, 0xC52E          FF Driver: n/a           Device Name: USB Receiver           Attached: 1      Controller ID: 0x0  Vendor/Product ID: 0x046D, 0xC52E          FF Driver: n/a           Device Name: RAPOO 2.4G Wireless Device           Attached: 1      Controller ID: 0x0  Vendor/Product ID: 0x24AE, 0x2000          FF Driver: n/a           Device Name: RAPOO 2.4G Wireless Device           Attached: 1      Controller ID: 0x0  Vendor/Product ID: 0x24AE, 0x2000          FF Driver: n/a           Device Name: RAPOO 2.4G Wireless Device           Attached: 1      Controller ID: 0x0  Vendor/Product ID: 0x24AE, 0x2000          FF Driver: n/a           Device Name: RAPOO 2.4G Wireless Device           Attached: 1      Controller ID: 0x0  Vendor/Product ID: 0x24AE, 0x2000          FF Driver: n/a     Poll w/ Interrupt: No     -----------  USB Devices  -----------  + USB-Root-Hub  | Vendor/Product ID: 0x8086, 0x1C2D  | Matching Device ID: usb\root_hub20  | Service: usbhub  |   +-+ Generic USB Hub