Malfunc drivers are causing failure in startup

I've tried every possible solution i know to fix this problem (system restore, startup repair, chkdsk/r, last known food configuration), none of them worked..

I realized that a driver is causing failure in my PC startup because when i booted in safe mode, i changed my startup to diagnostic in system config, and my pc booted alright. but when i chose "normal" or "selective" startup, my PC just SHOWS ME MY LOGON SCREEN, I LOG ON SUCCESSFULLY, THEN IT SHOWS ME THE LOGON SCREEN AGAIN.

Has anyone encountered this problem, and any solution you recommend?? PLease?! It would be of big help..

Welcome
If it works in clean boot and if you follow the clean boot procedure we can determine the cause
How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7

Thanks. I'll try it and let you know..