BSOD for unknown reasons

[cwhite]

I've been getting BSOD's for a couple days now and I'm baffled. I would greatly appreciate any help.

Windows 7 home premium X64 retail
Hardware is about two years old.
One of the steps I took was to reinstall windows just a few days ago.
I have run memtest86 and came back clean.
I have updated bios.
I also used windows HD checker.
I have also switched graphic cards.

 

[yowanvista]

Error 7f is usually caused by Zone Alarm Firewall
Remove any Zone Alarm software using the removal tool

BugCheck 7F, {8, 80050031, 6f8, fffff80002a8ce3b}

Probably caused by : ntkrnlmp.exe ( nt!KiDoubleFaultAbort+b2 )