system
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Very easily fixable. First download rkill from Bleeping Computers. Rename the download to some random number. Then download the exe fix.
http://www.dougknox.com/xp/file_assoc.htm
http://www.bleepingcomputer.com/download/anti-virus/rkill
I can send you the exe fix also. After you do those steps you should be able to install MBAM and run a full scan. Keep in mind that no security in the world can protect you. If you turn up Avast’s settings and enable PUP (Potentially Unwanted Program) you will be better off. Lets worry about that last. Let me know if this works.