No idea why you would choose Educational Services for this post, I have emailed management to move it to the right area for you.
Rather than wait for this to be moved to the correct area I'll try to help, although your post really doesn't explain much in the way of details, such as operating system, service pack, name of McAfee software etc.
Try running the Virtual Technician to see if it finds and fixes anything: http://mvt.mcafee.com/
If that doesn't help, go to Control Panel > Programs and Features and uninstall everything "McAfee", then run the consumer product removal tool: http://download.mcafee.com/products/licensed/cust_support_patches/MCPR.exe and reboot.
If none of this helps then contact Technical Support, linked below.
Toronto ▪ Canada
Volunteer Moderator - Consumer Products
I CAN'T HELP PRIVATELY - PLEASE POST IN THE FORUMS
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Topic moved to Consumer > General Discussion.