XP Won’t Boot

Xp installation won’t boot past windows logo.
Specs:Amd AM2 6000+ -GA770-DS3 m/b-Shaw 600w psu -Geforce 9600 GT
Netgear WG311 pci card -seagate 5oogb hhd all brand new including Os.On the occasion that it does start it may run for two hrs and then It’ll just reboot for no reason and go through the cycle again. Only windows and m/b drivers and Nero 7 installed .NO error codes at all.Posts normally.Any help on this would be most appreciated.