If I were sitting in front of your computer I could think of many things to check, but since I am not, I only have a few shots in the dark. First, let's try to clear the Flash Player's own temporary files. This is easiest done by using CCleaner. Download, install, and run it. On tab Applications, Multimedia, check 'Adobe Flash Player'. Before you click 'Run Cleaner' make sure that Cookies are unchecked under Windows (Internet Explorer) and Applications (whatever other browsers you have). Now click 'Run Cleaner'; this may run for a few minutes because it does a lot of cleaning. Do not run the Registry cleaner! Did this make any difference - try to install Flash Player again. Next thing I would try is to run CHKDSK - Start -> Run -> cmd -> chkdsk /f You may need to reboot to get CHKDSK to run. Last thing for today, check your system for malware that is not covered by McAfee (what product is it exactly, VirusScan?). Run a full system scan with Trendmicro Housecall - it will show you if you have any malware infection on your system that could be responsible for your Flash Player installation problem. Sorry, I will be off for a few days, but I may check in here sometimes.
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