This sort of error is often caused by faulty RAM. If you have more than one stick, take one out and use it. If it doesn't crash you know the one taken out is faulty. If it does, swap them over and try again.
If it still crashes, next thing is to test the hard drive. Download a diagnostic utility from the manufacturer's website and test it.
-------------------- OK OK I can't go any faster! aaaaaaaaaaaagh!