Hello. I don't claim to be an expert on your problem but try this and see what happens. It's possible that something on your computer may be blocking the installation of Updates so begin by restarting your computer and logging on with a user account with Administrative privileges. (NOTE: If you're unfamiliar with any of the following procedures, research them BEFORE attempting them and BEFORE logging onto an Administrative Account). 1) Run a FULL Virus and Spyware scan on your computer. 2) Clean out your "Temp" folder: Run>>Open:>>%temp%. 3) Find and run "Disk Cleanup" in your computer's Systems Tools folder and delete all entries there. 4) Delete your "Browsing History:" Control Panel>>Network and Internet Connections>>Internet Options>>Browsing History. Make sure everything is checked and delete everything. 5) Configure and Run McAfee's "QuickClean" in McAfee's PC and Home Network Tools. After this, go directly to McAfee's Support website and see if you can re-run or re-download MVT again. Please note that none of the steps outlined above will harm your computer. These are a simple fix which I've used in the past with quite some success but if they don't work, check back here and someone else may offer other advice. Good luck.