Curious if you were setup port for Skype as follows:
File -> Options -> Connection -> Uncheck "Use port 80 as an alternative for..."
Anyway, I don't think it's a problem from McAfee, but I've seen a lot of people had hard time to get wamp working after they tried xampp, even already uninstall xampp
Since your wamp is new, so I assume you don't have any data yet, thus, suggest that uninstall wamp, run regedit to find and delete all intances of wampapache, wampmysql, apache, mysql, php, and any xampp related, restart computer and reinstall wamp
Have fun,
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