if your computer runs for a while then shuts down, this is often a lack of power to the system. Try removing anything you can live without (modem card if you use ethernet, soundcard, extra fans) and see if will work then. Most likely this won't work but its worth a shot as the only other alternative if it is a lack of power, is to buy a new PSU will will run you around $100-$200 and is the most difficult piece to install in a computer.
Also you can use a tool to diagnose whether it is a software problem, try ErrorFix. http://www.make-pc-faster.com/
When my computer would unexpectedly shut down on its own it turned out that the processor fan was bad and the computer was shutting down due to the processor overheating.
turning the computer off
no you are shutting the coumpter down whats the point?
They aren't shutting own webkinz.
Yes, it should stop all shutting down actions by your computer if the system is overheating.
Have you tried shutting down all programs, then shutting down and re-starting your computer ?
No.
many reasons but just scan your computer to be on the safeside
You have a virus. Or it is continuously overheating?
Using the "start" button to shut down your computer gives your system a "heads up", if you will, that you are shutting it down. Shutting a computer down abruptly could be destructive to the system if you shut it down in the middle of an important process.
The hard drive saves all data on your computer and will stay saved after the computer shuts down. RAM will temporally store data but will be deleted after shut down.
Re-booting your computer will refresh everything without shutting it down completely.