system
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Reinstalling XP is not an option, so I tried installing SP4 from the link. Once it started, Avast detected 3 threats. I cancelled the installation.
If the files are not signed, is it possible to know if those are the “real” ones or if they are infected files? Was the computer clean or infected before what I got during the installation of SP4? Should I throw everything away and sit down and cry? :-[ 
Edit
The computer was too slow before for me to attach screenshots, but now I have a few. New things are popping up, like dc23.exe and dc24.exe.
