Windows Installer says disc needed to continue counterspy update

Counterspy downloaded the new version; 3.1.2416, yesterday. A windows installer appeared and began to state I needed a disc to continue. After this cycle continued; I attempted to uninstall Counterspy to do a new install. At add/remove programs I clicked change (on XP by the way) and the windows installer appeared again; and would do nothing more than say I needed to insert a disc. I tried other removals as posted on this forum; such as deleting folders in the program files. I cannot remove Counterspy and when I reboot the windows installer appears yet again. My goal is to remove Counterspy and reinstall cleanly; but the installer does not work. any ideas??? thanks.