explorer.exe closing

[T]

I realize that my laptop is running slow so I checked the task manager and
saw that explorer.exe was taking up all the cpu usage (which I never saw it
done before), so I tried to restart it by ending the process and run it
again. I then realized that explorer.exe used up all the cpu because the
window sidebar was running so I turned that off and explorer.exe didn't use
that much of the cpu and everything was running smoothly again. However
another problem came up that I can't figure out. explorer.exe keeps shutting
off when I tried to open any window (ie. My Computer, Document, Picture). If
anyone knows what I did wrong or how to fix the problem please help, thanks.

 

[T]

I have McAfee security (which came with pre-installed).

 

[T]

I uninstalled McAfee and installed Avast, but the problem is still there...
When I try to open a folder, it would stay white for a while then explorer
close...

 

[T]

I did the scan and it gave me this message...

Windows Resource Protection found corruption files but was unable to fix
some of them.

Assuming you used the McAfee Consumer Product Removal Tool. Restart your PC.
If no joy,
Run sfc /scannow.
-------
*Report back, please*
[When responding to posts, please include the post(s) you are replying to so
that others may learn and benefit from the issue]

[How to ask a question]
http://support.microsoft.com/kb/555375

I uninstalled McAfee and installed Avast, but the problem is still there...
When I try to open a folder, it would stay white for a while then explorer
close...