Just go to the Control Panel, Add Remove Programs, and uninstall Parallels Tools, unless you already started manually cleaning up or used another program to uninstall it, and in that case Parallels Tools uninstall might fail or the entry was deleted from Add Remove Programs.
The clean way to remove Parallels Tools is to use the uninstaller, I would suggest you install Parallels Tools again and then uninstall it with it's own uninstaller, only after that you should look for leftovers (unfortunately, any program installed on Windows will leave traces, normaly they are just dead-weight and have no influence except taking up space in the registry).
But something doesn't seem quite right with your story thou, first you say you are testing both Parallels and VMWare, and later when referring to the uninstall you say 'it was a while ago'.
Last edited: Feb 13, 2013