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It is a known Microsoft issue and is common to many protection software suites, not just McAfee & has been posted widely all over the web for ages now.
McAfee can't sense when you are about to install a service pack. It's always a good idea to do some research first.
Always disable your anti-virus and possibly your software firewall too when installing something as major as a service pack. Enable Windows Firewall in the meanwhile.
We have helpful hints & "how-to's" posted HERE.