What could be the cause of games crashing?

Hey, sorry to bug you all, but this has been bothering me.

Over the course of the last few days, I've had several games crash on me during play, including World of Warcraft, Team Fortress 2, and Borderlands 2.

Last night, World of Warcraft crashed on me and didn't give an error message or anything, IIRC. About six hours ago, the same for TF2. And just about thirty minutes ago, BL2 froze but did give me a "This game is not responding" thing, and it was marked as Not Responding in task manager, at which point I had to end the process. I assume the BL2 crash is more normal but the WoW and TF2 crashes didn't give any messages or any reason as to why they crashed.

I was wondering if anyone could list out a few reasons for why they might have crashed and, if possible, what I can do about it.

My specs are:
Intel i7-3770k Ivy Bridge
Sabertooth z77 Mobo
Corsair 800w Power Supply
4 200mm fans
Liquid CPU cooler

My temps are all normal and, but here they are if you need to see them: http://i.imgur.com/RqOp6.jpg (Idle, internet browsing), and http://i.imgur.com/z7yWS.png (After playing Planetside 2 on max for about 45 minutes.
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More about what games crashing
  1. Team Fortress 2 just froze, is that something to be worried about or is freezing mid-game a common occurrence? Also, forgot to mention that I did a full scan with Malware Bytes and Microsoft Security Essentials and uncovered nothing.
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