The McAfee Consumer Products Removal Tool [1] has been mentioned several times in this thread, Robynn. Have you downloaded/run it yet?
- Fact: McAfee (and Norton) applications are notorious for not uninstalling (or upgrading) cleanly. The "leftovers" may be your troublemaker here.
==============================================
[1] Direct Download: http://us.mcafee.com/apps/supporttools/mcpr/mcpr.asp