Help: Computer locking up erractically

Hey all,

I've been having some problems with my pc crashing for a few months now. It seems to happen very randomly, like it could happen once 20-30 mins of the last crash, or go 1-3 hours between the last crash, or even a whole day!
It recently went a few days without a crash, but started happening again frequently.

Crashes seem to happen no matter what I doing, whether it be me on the internet, or playing a video game.

When it crashes, there is no BSOD, no restarts no turn off's just a freeze/lock up, which requires me to hit restart.

I've just cleaned my pc out with compressed air, but it seems to still be here.

Any ideas? No idea what tests to run :(

PC:
Windows Vista 64bit

Arctic Power 700W PSU

OCZ 4GB (2x2GB) PC2-9200C5 1150MHz Flex II Passive/WaterCooled Dual Channel DDR2

Intel Core 2 Quad Q9450 LGA775 'Yorkfield'

Arctic Cooling Freezer 7 Pro CPU Cooler

Asus P5Q Pro Intel P45 (Socket 775) PCI-Express DDR2 Motherboard

Creative XI-FI sound card

ATI Saphire 4870 Graphics card
 
How are your temperatures? Do you have spare parts to swap in for testing purposes?
 
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