My Computer keeps searching, Media Center won't work

Hi, hopefully someone can help me, this is really annoying..

Everytime I click "My Computer" it keeps "searching for items" and after about 5 minutes will either come up or freeze. If I click the drop down on the address bar it freezes also. It does it everytime. I have no problem going to any other folders.
(Windows installer also was giving me the error message "Windows Installer service could not be accessed" when installing or uninstalling, but I've re-installed that following a tutorial I found and it seems to work now.)

I've searched and read about this type problem and have already tried everything i found, including disabling "automatically search for networks and folders" in the folder options and disabling Windows Image Acquisition service. Neither worked.

Along with that, my Windows Media Center 2005 will take just as long to load then freezes and shuts itself down. My Window Washer program also will just freeze on opening.

My Internet (IE 6) works just fine. Media Player 10 works fine also.

All of the problems started at the same time. I was also getting a message from my ATI Control Center saying it could not access the graphics (or something like that) because I wasn't the Administrator. However, I am the Administrator and there are no other user accounts on my computer. I also changed my graphics card from ATI to NVidia 2 years ago, so I uninstalled ATI and re-installed NVidia drivers to see if that would help. Nope.

I've run anti-virus, ad aware, and spybot. No problems found. I would do a Windows repair to see if that works, but my computer did not come with an installation CD. It was all pre-installed. (I did make boot disks for it).Hi-jack This log will follow below.
Thanks for any help you can give!

Windows XP Media Center Edition Service Pack 3.
HP Computer. 2 GB Ram. Intel Pentium D 940 (3.2Ghz)
GeForce 7600GT graphics card.

 

I had a problem related to ATI drivers a couple of years ago.... I had an ATI card which I upgraded to an NVidia card. Apparently, during the ATI uninstall, not everything was removed. However, the PC worked fine for about 6 months, then, out of the blue for no reason, all the DVDs and CDs I burned were no good, and the PC would occasionally lock up. Also, if I was browsing through a folder full of assorted video files (AVI files, MPG files, etc), Windows Explorer would lock up and eventually error out to a "Windows Explorer has stopped responding" message. After researching it, it all boiled down to a left over .DLL file from the old ATI drivers. Just to be safe, I renamed the file from "filename.dll" to "filename.dll.old". I rebooted and the problem never happened again.... I ended up just deleting the file. The only reason I didn't delete it right away was because I have an AMD chipset and thought that maybe the file was needed, but it wasn't.

(yeah, I know, not a lot help, but maybe something similar is going on with your scenario)