Hi phils2.
It sounds like Mcafee has become corrupt, I would uninstall Mcafee Using the Mcafee Uninstaller,(Not add & remove programs) at Start/All programs/Mcafee Uninstall.
You can reinstall it, if you wish, Just make sure you password protect the settings after updating the defs.
Try Limewire before you reinstall Mcafee, as a test.

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mickjapa108