DO NOT REMOVE THEM MANUALLY !!!!
The McAfee virus scan is a good one. If you visit their US support site click here and opt for an internet chat session with one of their technicians they are excellent.
I had a problem once with my laptop and I had to remove viruscan manually and re-install. They sent me the upgrade files remotely with full instructions. Excellent service but be warned the initial connection time to reach an assistant can be 20 minutes or more.
Alternatively browse their support site and find the instructions to remove your version of viruscan from your operating system. This will involve editing the registry so back it up first!