Windows 7: How do I fix appcrash on my program?

dont know what the cause. before this problem happen, i was using window 7 home x64 but after i change my OS to window 7 ultimate 32 bit. i always got appcrash especially game program
when i start star wars fu2 or fallout new vegas or alpha protocol it appear like this

Problem Event Name: APPCRASH
Application Name: FalloutNV.exe
Application Version: 1.0.0.240
Application Timestamp: 4c9808f2
Fault Module Name: FalloutNV.exe
Fault Module Version: 1.0.0.240
Fault Module Timestamp: 4c9808f2
Exception Code: c0000005
Exception Offset: 006002a5
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 1033
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

Problem Event Name: APPCRASH
Application Name: APGame.exe
Application Version: 1.0.0.0
Application Timestamp: 4bd8888d
Fault Module Name: StackHash_0a9e
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 00000000
Exception Code: c0000005
Exception Offset: 00000000
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 1033
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789


someone can tell me what the problem is?

Update your graphic drivers
Run the SFC tool SFC /SCANNOW Command - System File Checker

i cant run sfc
should i reinstal window 7?

Boot in safe mode and try again