I have the same problem, i tried to reinstall MTA but that didnt solve the problem 
Here's my core log: 
 
** -- Unhandled exception -- **
 
Time = Sun Aug 23 13:21:37 2009
Module = D:\MTA San Andreas DM\mta\game_sa.dll
Code = 0xC0000005
Offset = 0x02E7923D
 
EAX=027F4C00  EBX=0851D228  ECX=00000000  EDX=00B9C080  ESI=028DDFE0
EDI=0A442464  EBP=0022FA08  ESP=0022F9F0  EIP=02E7923D  FLG=00210216
CS=001B   DS=0023  SS=0023  ES=0023   FS=003B  GS=0000
 
** -- End of unhandled exception -- **
 
And here's my core.dmp (right click, save as)