Hmmm,,, sounds like you better check your rights and permissions on the laptop too,, in XP if you are not in the administrators group you will have a lot of difficulty and weird behaviours from software that you attempt to install,,
as MB said,, if you run the install over and over again,, the cleaning process also includes the registry,, which if you dont have the experience to clean,, could turn into a rebuild,, so back up all your files one way or the other,,
I would say check your permissions,,
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