It's not clear to me if you just installed these drives or were they working fine up until now? Are the jumpers on the back set correctly? Master/slave or cable select?
Can you tell me if the drive is detected under device manager or check if the drive is getting detected under bios- Because if the drive is getting in any one of the places Changing the IDE cable will not help -- Tried to boot the computer with windows Xp anf if it does than the issue will be with windows Xp and u will need to reinstall windows--