What is the problem my computer restarting every time

[issa_81]

Hello,
what is the problem/ my pc computer restarting every time when am doing my work..
specification
os-window 7
c.p.u 3 ghz(duol)
h.d.d 320 gb

 

[pauls3743]

What type of reboot is it?

Black screen, blue screen or something else?

 

[henydiah]

everything is possible caused that : heat, hardware failure , driver wich, fan not spin / too low