I have an Intel based computer running Windows XP which randomly reboots itself. This could be while running Microsoft Word 2000 while selecting "Save As" or even selecting the My Computer shortcut (Windows key +E). The computer just goes blank and then behaves like it's just been turned on from scratch. Sometimes the work done in Word is recovered and sometimes not.
The processor (according to WinMsd) is x86 Family 15 Model 3 Stepping 3 Genuine Intel. The OS is XP with Service Pack 3. Total physical memory is 512KB and total virtual is 2GB.
Does anyone have a suggestion. We have an up to date version of Symantec's Norton 360 installed so I am assuming a virus or trojan is not to blame. We sit behind a Router with NAT built in so computer is hidden from the outside world. Ports have not been left unprotected. The router is Netgear MR814V2.
Get your hands on another anti-virus, along with an anti-spyware (or 2, I personally run Ad-Aware Pro, and Spybot Search & Destroy, first one's paid but there's a free version, spybot's free), take your PC off the network, and scan like crazy. No anti-virus or anti-spyware is 100% effective, and on rare occasions can become corrupted themselves so that they appear to work properly but actually let nasty things run rampant. Your best bet would be finding one you can load from a CD made on another (clean) PC to eliminate the possibility of corruption, but I'm not totally sure where you'd find one of them (in fact if anyone knows, feel free to reply with info!)
Also, get memtest to make sure your RAM's still working and hasn't developed a fault due to old age. I'm guessing that's your problem if your total physical is 512 KB... sure you don't mean MB? 512KB would be a lot for windows 3.1's era, but now it's what you make fun of at parties with 2GB RAM sticks. Wait, I'm the only one that does that?
Just another though - download CPU-Z and tell us what the CPU's actual name is... x86 Family 15 Model 3 Stepping 3 Genuine Intel doesn't mean much to most people on here. I'm thinking it's a ~3 GHz Pentium 4 though, but that's just a guess
Give us the rest of your system specs, and be specific, motherboard, PSU, hard drives, graphics, etc. etc. etc.
If you are not 100% confident to go trouble shooting you could always try the fresh install of Windows..... chuck in some extra ram and you will be up and running as good as the day ou bought your pc.
Norton used to be notorious for causing system instability on lower spec pc's - loved to use as much system resources as you would like to chuck at it.
360 is much better - so dont think thats your problem. Open task manager (CTL + ALT + DEL) - check the performance tab to see if your CPU is runnning maxed out at 100% if it is then chances are it could be spyware / virus. While you have the task manger open check how much physical ram is free / and how much virtual memory you are using.
If you are lucky it could be just a RAM upgrade...