Please advise what is the problem

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My PC is have following problems, please advice me how to fix them:
1. Windows XP (SP2) security center can not open.
2. Task manager does not show any processes running.
3. Unti-virus program Avast! can not update
4. Regedit.exe can not be opened.
5. Windows can not auto-update
6. Another strange thing is, when I try searching the term “security center” on Google using either IE or Firefox, the browser will automatically close. Same things happed when I try to search the popular unti-virus software names.

I tried using Ad-ware and Spy-bot but no success, now I have uninstalled the Windows SP2. One urgent question is, if I backup my data (like pictures and DV clips) now, will it be infected.

Thanks a lot for help.
 
If your files are infected then your backups will most likely be also.

I'd almost say you need to format and start anew. Some of your problems sound like access rights, but if you are able to install programs that shouldn't be the issue. You may try McAfee's stinger. It has fixes for many common virii.
 
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