OK, to make it short: Adaware will remove the problem with McAfee. The same problem frequently appears in other forums for Imesh and Grokster. BTW. If a broken virusscanner is the only problem Cydoor caused for you, you´ve been lucky. I´ve experienced much worse things myself.
Run Adaware, let it delete everything that is Cydoor related, then uninstall and reinstall the scanner and go and look for LimeWire 1.7 (the one without cydoor)