How can I tell what's failing?

[modernoto]

Recently, my computer has been crashing/freezing/being really slow. When running WoW, it'll sometimes freeze completely or move very slow (being my whole PC) to the point where I have to restart the computer.

I had a BSOD a week or two ago, and just this evening I left my PC running while eating dinner and I returned to it frozen up and looking very similar to this http://img232.imageshack.us/img232/7987/crash.jpg.

I've checked in my task manager to see if something was eating my memory and saw chrome had a ton of processes, one of which consuming something like 800k. I've scanned for malware and viruses and found nothing. Anyone have any advice?

Components:
ASUS Z87-A Motherboard
Intel i5-4670 CPU 3.40GHz
8 GB RAM
Windows 7
AMD Radeon HD 7950
AMD Sound Blaster Z Sound Card

 

[JackNaylorPE]

When was last time you reinstalled Windoze ?

 

[modernoto]

When was last time you reinstalled Windoze ?

I made this computer probably about a year ago, which is when I purchased and installed Windows.

 

[gogi]

I'd go at it and reinstall windows.
But first yoi can try scanning for viruses, doing a disk defragment, free up space if youre running low, also clean your rig of dust if you havent already.
Check if all fans are working and temperatures as fine (might be overheating and throttling)