How can I fix my Dell 2400 desktop with Windows XP Home?

A house I just bought had this Dell 2400 in it. I turned it on, not checking the CD drive first, only to realize that the "Dell Operating System CD" was in it. When I got back to the computer, this is what was on the "blue" screen.
(It is not hooked up to the internet.)


A problem has been detected and windows has been shut down to precent damage to your computer.

BAD-POOL-CALLER

If this is the first time you’re seen this stop error screen , restart your computer.if this screen appears again, follow these steps:

Check to make sure any new hardware or sofeware is properly installed . if this is a new installation , ask your hardware or sofeware manufcturer for any windows updates you might need.

If problems continue ,disable or remove any newly installed hardware or software,disable BIOS memory options such as cashing or shadowing. If you need to use safe made to remove or disable components. Restart your computer, press F8 to select advanced startup options , and then select safe mode.

Technicial information:

Stop:0x000000C2 (0x0000007, 0x00000CD4, 0x00340045, 0xE1507864)

Beginning dump of physical memory

Physical memory dump complete contact your system administrator or technical support group for futher assistance.

What do I do?