You might get more feedback in the V&S forum,click HERE
Tom
I recently purchased an update for TM Internet Security Suite 2005 to the 2006 version. However, when I try to install it I receive the following message:
"A fatal Windows error occurred. Setup detected a problem with your operating system. Please restart your computer, and then try again."
My operating system is Windows XP Professional with all critacle updates installed from Microsoft. I sent a log file to TM but so far no solution.
I reinstalled the 2005 version without a problem.
Any ideas? Thanks!

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic