Oh sorry murrya, forgot to tell you about that. The screenshots are not saved on hdd, they´re stored in RAM only.
So open paint, create a new document and then press "ctrl+V" or click
"paste" in the menu"
After that you can save the picture.
Good you managed to post the bluescreen output, after looking trough the microsoft knowlegde base your error code
(0xC2 Stop error
Parameter 1 = 0x07 : Attempt to free a pool that was already freed)
can point to almost everyting possible
included is the possibility of faulty hardware.
microsoft recomments further debugging with a memory dumb file (is created in your system root folder at crashing)
and the tool "Dumpchk.exe" that comes with the support tools on your XP - CD.
So let´s do some easier stuff first. Test your system memory
Download this iso image and create a bootable cd with a cd burning software of your choice (extract the file, go to "recorder" =>burn image" if your´re using NERO.)
http://www.memtest86.com/memtest86-3.2.iso.zip
Put the just burned cd in a drive where the computer is able to boot from, reboot and let run the test for some time (the longer the better) watch for error output.