:( PC always getting restart

[ZeratuL]

help me pls

internet cafe shop

my 1 pc always restart in every used amount of time 3hrs sometimes 1hr, 2hrs.
i try to replace my memory and reinstall my OS but it still same problems happen.

my specs

cpu: celeron 1.7ghz
os: windows xp pro 32bit
mobo: MV43 v3.1
memory:1gb ddr400 elite
video card: 64mb nvidia mmx

[Broni]

Overheating?

or....

Disable "Restart on error" feature...

1. Right-click My Computer, and then click Properties.
2. Click the Advanced tab (Vista: click Advanced system settings).
3. Under Startup and Recovery, click Settings to open the Startup and Recovery dialog box.
4. Clear the Automatically restart check box, and click OK the necessary number of times.
5. Restart your computer for the settings to take effect.

You may see some error message. If so, post back what it says.