My Satellite A300 keeps freezing every 5-10 mintues

Hey guys,
I bought a Satellite A300 a little less than two years ago, and two days ago it started freezing every 5-10 minutes.  When it freezes, ctrl+alt+del does not do anything.  I have to shut down the computer by holding down the power button.  I managed to run a scan with AVG and there are no viruses on my computer.  Occasionally when I boot up my computer a Disk Check runs.  I'm not sure what to do, any help would be appriciated!
Thanks!
Tanya

Satellite Pro A300-195 (PSAJ1E-01200XEN)
Hangs do not point to hardware.
1. Try to identify a situation or pattern that exists at the time.
2. If you only need to wait five minutes, we could try some experiments. What happens, for instance, when you boot into Safe Mode (the first option on the menu)?
   A description of the Safe Mode Boot options in Windows XP
3. If you can manage to capture the computer-clock time of a hang, we could try to look it up in Event Viewer.
-Jerry

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