Hello;I have a old pent.3 machine western digital 80 gig hard drive.Was running fine with windows xp and this one hard drive on the primary cable..tried to add a second hard drive,it was a 20 gig older ide drive,had the jumpers all ok,but no go.So I put the single 80 gig western digital back single drive on primary side no jumpers,and now windows won't startup.Starts to boot,see's drive in post,shows info then pops up,to either start windows normal,safe mode,safe mode with network,command prompt,No matter what I select it says missing or corrupt windows\system32\ntfs.sys,,,you can try to repair with original cd and press r to repair?.Man what did I do? I hope I didn't destroy the whole thing.Was runnning perfect,all up to date and all....Will this repair work? any idea's what happened?