My computer does this very annoying thing where it freezes randomly, and I have found no consistent trigger to this event. It just recently started to happen and it happens several times a day too which is quite annoying.
The only consistent things I have seen are this:
1. It happens the most when I am surfing the web using Firefox
2. It also happens when I load games, I have mainly been playing Blacklight: Retribution so i haven't seen it on any other, yet.
3. I have noticed that the audio for my computer will continue. EX: I was loading into a game and I was on Teamspeak talking to friends and my computer froze up, but I could still hear them talking.
Here are my PC specs (it is custom built by me):
Processor: Intel i7 3770 Quad Core (Ivy Bridge)
Ram: 8 Gigabytes of DDR3 Kingston
Graphics Card: Geforce Nvidia GTX 560 ti
Mother Board: ASUS P8Z77-V LX
Hard Drive: 1 Terabyte Toshiba HD
Power Supply: Ultra LSP 750 Watt
Case: Cooler Master HAF 912 RC-912-KKN1 Mid-Tower
Edit: I have already run a full virus scan using Microsoft Security Essentials and Malwarbytes Anti-Malware