It sounds as if you have something running in the background that is causing a conflict with the install.
Click on Startup Tab
Do a Google search on everything with a check mark and see what it is and if you need it running at startup.
Uncheck the ones that are not needed, restart your computer.
Turn off the Virus Software & Firewall via Right Clicking them on the right side of your taskbar, install your software, restart your computer.
Edited by River_Rat, 31 August 2005 - 09:30 PM.