Hi
Please clarify,
What is the version of operating system you use (Vista / XP)?
Did you receive any kind of alert/advertisements or pop-ups in the computer?
Steps:
Ping the Downlaod.mcafee.com and post the IP address you get (Start-Run-type CMD- ping download.mcafee.com)
Download the tool from:
http://download.mcafee.com/products/licensed/cust_support_patches/MSCPRXFIX.exe.
Double-click MSCPRXFIX.exe.
After running the tool, restart the computer. To check for updates, right-click the M icon in the system tray and select Updates.
Perform the McAfee Virtual Technician in both computer and post the session ID
http://mvt.mcafee.com/mvt/default.asp