When my VISS updates, it will get stuck at 50% or 60% and stay there until I reboot, because it really slows down my computer. I downloaded and ran the MVT and the results were "Product configuration xml file missing" on Virus Scan, Quick Clean and Shredder, Security Center, Site Advisor, Personal Firewall, Anti-Spam, and McAfee Home Network. It said the MVT couldn't fix it, so what do I do now?