Won't let me log on, please help!

[jdporter18]

My 3yr old hp pavillion is currently giving me many problems. Now when I try logging on it goes black for a second then will take me back to the log in screen. I usually have to bring it back to a restore point then when I restart it goes back to not letting me on again. I went into safe mode and it logged me on and when I did I did a virus scan with AVG and Malwarebytes antimalware. What else should I try?

 

[ttran]

You might want to try a clean boot to figure out what cause the problem:
How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7

I doubt sometime AV program such as AVG can cause problem with start up..

If it doesn not solve the problem, I would suggest to do a http://www.sevenforums.com/tutorials/1649-clean-install-windows-7-a.html

Also, run a system file check as well:
http://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html

Regard,

Tuan