It is possible that in one of the installation attempts, a part or component of McAfee encountered and error and was corrupted. You'll need to get any McAfee file out of the computer first to make it a "clean" installation.

Follow the steps from this post;

http://answers.msn.com/thread.aspx?threadid=eb40fdcb-a594-4c77-9d55-8dd2ed6a218a

If you are still unable to install after you did all the steps in the said post, please reply here and include any details which may help us understand this issue further. For instance, was there an error message? And are you signed in the machine as a computer administrator?





Thanks!
Natasha