A friend brought his Laptop round the other day for me to fix and when I looked at it I realized his Windows install was completely corrupt and even missing some files! So I formatted and ran dskchk /f /r, this took 12+ hours to complete and it found and 'corrected' a lot of errors. However I still cannot install Vista or XP, I can get Vista to install to the point where it reboots and upon boot it tells me something along the lines of: C:\Windows\System32\ntoskrnl.exe is missing or corrupt. XP pretty much does the same although it doesn't give me the exact same error. When I run disk checker after the Vista files have been copied to the HDD (after the first reboot) it shows most of the files as corrupt. I've formatted and run disk checker many times and I've used Ultimate Boot CD 4.11 to do a full low-level format (which also took a very long time) but it's still the same. Do you think this Hard Drive is well and truly broken and what can do this to a fairly new Hard Drive? Thanks in advance.