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)