I'm not sure if you are aware of this oldnurse, but Mcafee has stated that they will compensate those that have been affected by their recent updates. Might be worth checking into. They openly admitted to screwing up, and I saw a news release that mentioned this. Sorry I don't have the link, but could mean some sort of compensation for their buggy update considering it is probably resulting in downtime for your company.
Might have to jump through hoops to get it, but still......worth looking into maybe.