I had installed Business Pro and then removed it using the Add/Remove Programs — I also cleaned out the registry. But the Windown Installer pop-up keeps coming back when I visit certain websites that have a lot of pop-ups. It asks for Windows Installer and the original disk — I do not have this. I use Windows XP Home Edition and clean my laptop using Ad-Aware and another registry cleaner — this is of no avail. Any help would be greatly appreciated. It’s really annoying and the pop-up only goes away after I hit cancel at least three times!