Some games & programs won't open in Windows 7

[g4mer]

When i click on... lets say GTA San Andreas, WinFast PVR2 (My TV Card)... window comes up and disappears in a second. I've done some tweaking on Windows 7 before, and that maybe caused the problem. I disabled some services in msconfig:
Copmuter Browser
Offline Files
Disk Defragmenter
Diagnostic Policy Service
Perf. Logs and Alerts
Remote Acces Auto Conn. Manager
Smart Card
Secondary Logon
Print Spooler
Tablet PC Input Device
Desktop Window Manager Sesion Manager
Diagnostic Service Host
Diagnostic System Host
Windows Error and Reporting
Thats it.
Someone knows if any of these services can cause this problem?