Delete Queen needs help!

Please help!

I am running Windows XP and CCleaner v2.04.543

I always update my Windows, spyware, anti-virus software, and CCleaner. I clean my "C" drive and perform weekly defrags.

The problem is when something is found, I chose to delete it, fix it, get rid of it, and don't back up the registry.

Lately, I am having major computer issues, where I cannot open files, files are not recognized, and my Windows Media Player will not work, not to mention open.

How do I undo what I have done???

I just want my computer back!

Is there anything I can do so that I don't have to go back to factory settings and loose all of my music downloaded to Windows Media Player???

Can you try a System Restore to a date before the problem began? (http://support.microsoft.com/kb/306084)