I am not a fan of McAfee security and AV products and haven’t been for years. Their software has become a huge drain on system resources and worse, seems to get more false positives than actually stoping malicious software. I highly recommend Microsoft Security Essentials. But if you are one of those that have had this issue I hope this helps.
McAfee recently put out an update that literally killed many machines.
If you are one of those people here is a possible solution.
1. If your computer is forcing you to shutdown (you are getting an error with a countdown), go to Start – Run and type cmd. At the command prompt type ‘shutdown -a’ without the quotes. [This will abort the Windows shutdown.]
2. Open up the McAfee console (Start -> Programs -> McAfee)
3. Disable Access Protection and On-Access Scanner
4. Double click your Quarantine Manager in that window, and restore the files there (right click on it and select restore).
5. Go to your services console (right click on My Computer, select ‘Manage’, and click on the services in the left pane). Make sure both RPC (Remote Proceedure Call) services are running.
6. Start (or restart if already running) the McAfee Framework service.
7. Back in the McAfee console, select Tools -> Rollback DATs.
8. Reboot and you should be all set.
Here is McAfee’s own solution:
http://vil.nai.com/vil/5958_false.htm