Fix this NOW. No bullshit, just fucking help me.

[MetalMilitia]

Its probably caused by one of microsofts new security features. For example mabey they have found that it is possible for a virus or malicious program to enter your computer via streaming .wmv files.
My advice would be to remove SP2 (provided you archived old files so it can be removed) then redownload it in a couple of months when its problems have been worked out.