Hi dear,
I am trying to give you solution for this. It is not like that it should work. But it may work. First check for virus with good antivirus. Then also it keeps restarting then goto CMOS settings and check for temprtr of ur CPU. It should not be more than 85 degree C. or 110 degree F.
If then also it kepps restarting then it may be problem of overheatting. So check for it.
By dear, hope it will help U little...
Narendra Kakkad, February 2008