computer automatically restarts after dumping physical memory ???
if that is the case, right click "my computer" and choose "property", click "advance" tab and choose "setting" under "startup and recovery"
uncheck "automatically restart"
you can do this step in SAFE MODE if you can't do in NORMAL mode
by doing this, you will know what cause your problem
if you installed any DRIVERS late, it is good to UNINSTALL this driver/ software to see if it solves your problem.
also, if you enable anything, try to disable it
NOTE: you don't need to SAVE "memory dump" in your computer because of 2 reasons:
1-you waste your hard drive space
2-it is useless for a typical user UNLESS you know how to DEBUG this memory dump.
the process of doing is very complex and beyond your understanding. ONLY developers know how to do it. MS technical supports don't know how to do this