A lot of things but I have of course tested it with all programs closed except AIDA64 and it still causes the display driver to crash/time out.. But the usual stuff I have running in the background is;
BOINC, Itunes, Malwarebytes, Kaspersky Internet Security 2013, Steam, Digital Persona Personal, Roboform, nvidia control panel, Logitech gaming software, Belkin Network USB Hub Control Center, HP Digital Imaging monitor, Firefox, Thunderbird.
Have turned them all off including Kaspersky and left AIDA64 on and it still crashes.. sometimes very often like once every 2 hours and other times it can take 1-2 days for it to happen. But its inevitible and since not having it running my PC has been running fine for like 4-5 days.
I don't run ASUS AI Suite but I know it conflicts with AIDA64 and when the two are running at once, AI Suite spams me with false alarm temperature alerts. But I never run it usually.. but maybe just having it installed is causing a conflict??
I should also point out that AIDA64 was one of the first programs I installed when I built this machine and it's been doing it since day one. A lot of the other programs I have installed over time.
Cheers!