thanQ you very much for your advice buddy....
But u know after the installation i chose its partiton style to be GPT (GUID Partiton Table) instead of MBR (Master Boot Record)
and i'm not sure whether i'll be able to boot from the new drive or not!
if anyone can tell me....it will be very nice of you
my pc specs are:
Intel DG-33FB motherboard
Intel core 2 Duo E8400 @ 3.00GHz
2 GB DDR2 RAM
and i'm using window 7 32-bit.
i should have chosen MBR instead of GUID if i won't be able to boot from the new drive!