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I'm having problems with my Windows Vista 64-bit machine.

It crashes or hangs a couple of times per day, usually when it's idle. When it crashes the screen freezes and and it takes no input from the mouse or the keyboard.

Where should I start looking to resolve this?

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What anti-virus/firewall/etc. do you have? –  Rowland Shaw Sep 1 '09 at 9:05
    
+1 because I have the same problem, only it happens when I'm gaming. –  Sasha Chedygov Oct 19 '09 at 5:09
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5 Answers

First step I'd take would be to check the device drivers, on the assumption that this didn't start happening suddenly, for example, after the installation of extra RAM.

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I'd have a look in the event log in administrator tools and see if there is a particular event associated with the freezes. Also it might be worth keeping an eye on the temperature inside your pc and checking out the memory with memcheck86.

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Don't rule out a faulty motherboard, or a faulty device. I once had an LG wireless PCI card, that would cause my system to randomly freeze up.... I only figured out it was the card after replacing RAM and Motherboard...

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I personally find that if it is just frozen - No bluescreen / random restart it is usually a faulty motherboard (can't rule it out, but a quick check is for blown capacitors) or a bad hard drive.

I am not saying that it isn't anything else as others have said, but I find that ram, drivers and devices, usually produce Blue screens and in my experience, 90+% of the time, if you mean that the machine is completely frozen, then it is one of the above.

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Or a bad power supply. –  EmmEff Oct 3 '09 at 20:09
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Check the Reliability and Performance Monitor. It might give you a few clues into what is causing your computer to crash, especially if it's in any way software related.

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