Explorer.exe 50% CPU - Explorer Bar > Folders

[CyberGlyph]

C:\WINDOWS\system32\nvsvc32.exe, is a proper working file from what i can tell. It was created and last modified Oct 2007, which is when i rebuilt and upgraded my system. It has been disabled and trying reboot to do some testing. Wallpaper.exe is a wallpaper rotator that comes with AdvancedSystemOptimizer, its legit and error free.

I thought it might be indexing too, but ive left it on over night and does nothing but raise the internal temp on my box... explorer.exe will run till you make it stop.

*rebooting
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I FEEL FREE!!! I love my computer again...

After the reboot and disabling the nvidia display it still had the problem. I did however catch that on either drive i had a file, movie; couldnt move or delete. I thought the problem was more random if that is what it was. I went thru safemode and took care of the 'movie files' or malware then booted again normal with the nvidia back enabled.
I only have room for 1hdd and 1dvdrom so i have a WD USB portable that i store things on , so in turn i jump alot through both drives most of the time.

The thing i dont get is why did it only happen when i hit 'folders' and use the tree, cuz remember i could browse fine if i used the slower mouse pounding method... Im still not getting problems and ive been messing around on and off while writing this.

Thanks for help, if anything turns back up or blows up ill post.