Symptoms
You are unable to install/uninstall/reinstall/update Parallels Tools or any other third party application using Control Panel -> Add or Remove Programs (in Windows XP) or Control Panel -> Programs and Features (in Windows Vista/7) inside your Windows virtual machine. They either do not get removed from there or are just not listed there, but the installer detects that the previous installation is still in place.
Resolution
Please run this Microsoft FixIt utility to remove Parallels Tools or any other software with a corrupted installation:
Diagnose and fix program installing and uninstalling problems automatically
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