MonitorWare Knowledge Base

I'm trying to install psp 7.0 which I just found I had the disc to. I before this had a trial of psp 7.0 and psp 8.0 and when i try to install it now it says Another version of this product is already installed. Installation of this version can not continue. To configure or remove the existing version of this product, use Add/Remove Programs on the Control Panel. So I try to do what it says and remove the programs, removing 7.0 completely will not work and i tryed finding the folders in my computer with the find wizard but it will not work. Any suggestions?