I can be working on a document or surfing, and my HP desktop(HP552W) will reboot and I have to start over from where I last saved....It sometimes does it about every 5 or 10 minutes...Is it the power supply or what shoul I do to troubleshoot this? Thanks

it can be the power supply but also memory, video card or simply overheating.

the easiest one is often overheating. get a can of air from the local computer supply place like walmart, circuit city, etc etc. open the case and blow out any dust from fans and heat sinks. also the power supply. try that and if it doesn't work we'll get into other possible causes.

Disable auto-reboot

When Running windows and it crashes you will get a blue screen and it will automatically restart, ofter it will restart too fast for you to see the error message. You could check the error log in this case but that is too easy. We are going to disable auto restart on system failure.

1. Go to Start -> Control Panel -> System (Windows+Pause works, too)
2. Go to Advanced
3. Under the Startup and Recovery section, click Settings...
4. Under System Failure un-check "Automatically restart"

Thanks for the help...This is not my unit, but I am remotely trying to help out a friend in another city. I disabled the auto reboot and this is the screen she got when it quit again in about an hour:

Windows shut down to prevent damage
file win32k.sys
page _fault in non paged area

***stop:0x00000050(0xc659b3b0,0x00000000,0x

bf8391e5,0x00000000)
there were several other notes about new software, etc., so I told her to reboot in safe mode and see if it did the same thing. Any other suggestions?

Several possibilities:
http://support.microsoft.com/search/defaul...mm=1&res=20