I have a Compaq deskpro w/Windows 2000 Professional os (service pk4). I don't have any installation Cd's or access to the network that supported it. My problem is that somehow the Window's installer (version 3.1) has become corrupt. Tried various remedies like MS update, and registry cleaners. But it still will not install software programs completely. Example: Windows media ver 9, I downloaded ok and began installing. It was copying files, updating registry entries, etc, then near the end msg displayed: Installation not complete try installing again. Any ideas?