intel system hang

Sumit

I upgrade my computer from intel
my new configuration is:-
Intel Original G33 motherboard
Intel C2D 2.4 GHz processor
667 MHz 1x1 RAM DDR-2
160 GB seagate HDD
Intex SMPS
Samsung CRT 15" Monitor (Old one)
I installed windows XP SP-2 and XP install successfully
and it works very nicely but after 10-12 min it get hang and then nothing happen
neither keyboard works nor mouse at the last i have to restart
computer there is no any other option left accept restart, i
thought this is the problem of my OS but i changed OS and install
vista but still problem is same as XP
I went to vendor and ask him, he changed my mother and replaced with new one but still problem is same
before i was took Intel 945 Mother after repeating the problem i changed and took Intel G33 Mother Board. when i
changed it to G33 Mother Board it run and it works properly after 10 days again the problem is same
my system is again hang. i do not understand what is the problem? my mother board has changed more then 3 times but
my problem is not solved I used another RAM and i checked my RAM to other computer it work i dont think it is the problem of my RAM, processor is left, But if any problem in processer then why it is working 10-12 min it should give FATAL error while installing OS or booting the system but OS is install and every application is working till 10-12 min.
I used Thermal paste for reduce heating i but still problem is same.
Please suggest me where is the problem what should I do?
if anyone having e-Mail ID of intel customer care or intel complaint
please give me .... i am very much fad up with my system.

Thanks a lot for ur time