The files are normally saved in c:\windows\minidump
The files for example if you have received a
BSOD yesterday will look like Mini080807-01.dmp. Can you attach a few if possible.
Failing that, as a last resort, the only other option is to get as much information as possible when the appears for a second before restarting, so you may need to watch for it many times before getting all the information you need. The specific information I'm looking for is highlighted here:
We really do need this information before we can help you further, as there are thousands of possible causes both hardware and software.