Why the pc reboot itself?

Did your computer reboot itself when you Surffing the Internet or when you playing the game. Even worse, after the rebooting you can’t go to the “welcome”..enter XP system.Those damn thing make you  feel depressed.
Unfortunately problems like this can be caused by one of 1000 different things.
some kinds of “computer restart  itself” problem analysis.
Software
1. A virus in the boot-sector or a bad (damaged boot-sector) might cause that.Worm virus is the most typical one which cause serious damage to computer for a period of time , they will also hints the system will automatically reboot after  60 seconds .The worm can infect your computer as soon as possible, even if you have reinstalled windows. The worm will infect your computer even if you have not downloaded anything.
2. System files damage also cause reboot,such as KERNEL32.DLL,The font below Win98FONTS directory  ,some system  basic file. You can have a try,renamed a “FONTS” . your pc will reboot again and again.
if your pc get those problem Above,you can clean your PC and fix the registered.registered is the core of your  system.we suggest you clean it twice a week.If you have no idea with what soft to use, go to here.   RegTOOL is an excellent Windows Registry Cleaner.
More, If you boot your computer into safe mode does it still restart after 15 minutes? It’s a system problem you (your windows) have. Download all the patches for Windows XP pro on a different computer, copy to a CD, and then apply to this machine.
Hardware
1. The utility voltage instability is one of the reasons.
If your lights dim a lot, you probably have bad power lines in your area,We can purchase UPS power to guarantee the stability of the computer.
2. So hot weather
Hot weather cause  cpu full work.then the machine will reboot to protect itself.
3. the power shortage of computer power
The situation is more common,especially when we rejoice in our host added new equipment, such as replacement of high-grade, increased CD writer, add hard disk. When the host at work ,it will get Power protecting.
you’d best change a Power.
4. Some other tings you can refer to.
RAM  problems,Cd-rom problems.PC Fan not work!