my computer restarts when i try to install any software!!!!!

hello all….

my problem is when i try to install any software on my computer …. it restarts by itself!!

i think it restarts when writing data into the regisrty.

i formatted my comp…and it happened with the first software i tried to install…

i aslo disabled all startup services and software but no use.

is it hardware issue or what?????

thanx everyone…