I used to love McAfee until there was some facts that leaked that they were considering allowing a backdoor for a trojan the US government agencies were developing. Norton when they were asked flat out said NO to the request. The trojan was hence dropped because it would have required that all AV software producers go along, but ever since then Mcafee has given me the willies.
Secondly, since moving to Norton, I have not had errors and problems like I had with McAffee 7.