Vista - After update many problems

I updated using Windows Update last week.

I run Vista Home x64

everything worked fine for a little while then I noticed my Vista Widget sidebar had a black background.

Next I was unable to click on different windows.

The only way I could call my desktop back was to Alt Tab

I tried restarting and I had a black desktop

I unplugged and restarted and it was fine.

I then uninstalled all the updates. It seemed to work fine for a bit then all the things about started happening.

I then recovered my computer back to 2 days before the updates.

Worked fine , then guess what same stuff.

I am sure it was the update. However, Best Buy and Dell did not provide me with the Vista disk so I cannot fully recover or reformat.

I am looking forward to a big argument with Best Buy management tomorrow as I explain to them I would not need to pay the $50 if they would have given me the software (that I purchased but have no access to) the first time.

Can someone help me troubleshoot this?