problem by my OS on a 80Gb hd, cant boot

i have a 80Gb hd and a 250Gb hd
me 80Gb was getting weard by not boot, blue messiges on the computer and so on.
i did get indows on the 250Gb, thet is ok, but how delete the windwos on 80Gb?
i have tryèd to boot and repair the 80Gb windows by a cd, but no, the cd? did not find the hd :shrug:
but i have meny thinks i want of thet who is on the 80GB
help!

to morrow i give it to a friend for a "test"
he can see on i for free:YIPPIE: :D
so i hope the repair is gonna get it to work.
but can try some self if i get som tips:)