Please, go to folder \windows\minidump and send the newest (recent) .mdmp files for analysis.
There is also C:\Windows\Memory.dmp file.
Better if you can compress (zip), rename it with an unique name, them and add some information about the BSOD and the link for this thread. :wink:
Upload it to this anonymous ftp server: ftp://ftp.avast.com/incoming/

Disable Automatic Restart:
System Properties > Advanced > [Startup and Recovery]Settings
Remove the checkmark from “Automatically Restart” in the System Failure section.

Besides Google also you can use:
MS knowledgebase: http://support.microsoft.com/search/?adv=1
Free memory tester (Run it overnight): http://www.memtest86.com/
XP error explanations: http://www.xptuneup.com/xptuneup_stopmessages.htm
BSODs: http://www.techmetica.com/howto/descriptions-and-fixes-of-blue-screen-of-death-bsod-crash-errors/

Manual dump: when the machine is in stalled state, hold down the rightmost CTRL key, and press the SCROLL LOCK key twice. This will cause a machine to ‘blue-screen’ and dump of memory will start.
More info: http://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=71

To generate full dump instead of only kernel (or small dump), see http://www.msfn.org/board/creating-memory-dumps-t130005.html.