McAfee AntiVirus 8.7 on HP PCs
Not sure if this is the right place, but something I've seen come up increasingly is a problem with Mcafee 8.7 not playing ball on HP laptops and desktops - mostly after installation it sits in the tray but disables everything important (on access scanner etc)
The problem lies within HP's bundled software - Virtual Firefox which I believe is built upon Altiris virtualisation?
Either way, fix is nice and easy - uninstall Altiris and/or Virtual Firefox, restart the PC and re-enable the important parts of Mcafee - or reinstall it. Job done :)
Thought as this is a bit of a "how on earth are they linked" issue that took a lot of Googling to find a fix for! :D