Ok guys, Thanx for all your help, I managed to install it..I installed it on a different hdd and it installed no problem, and after it was installed I added the first hdd as a spare. Strange thing is, although windows installation disc said that it formatted the hdd partion , there was still a small partition on it.
I spoke to a guy from gigabyte forum, and he says that he also has this problem with a dell computer and he reckons that the hdd was tatooed.
Anyway all's well now... I have now installed an intell 80g ssd as my operation system drive,,,,boy these drives are fast.
Thanx again all