I found the answer myself:
http://www.computing.net/windowsxp/wwwboard/forum/132440.html
it is indeed a residu from a virus.
I had to delete and change some registry settings.
I don't know how I did it, or when it happened.
But I just noticed I can no longer change the themes of my computer.
I mean the complete tab is missing from my "display properties"
I only have "screen saver" "screen scan" and "settings".
I have another user on this computer, and when i...
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