We bought a company recently. We moved their whole operation
to our location.
This included several Windows servers.
Upon boot, one blue-screened and refused to go any further.
We have a Windows admin (credentialed, with experience,
as much as I hate his career path, I respect him).
He was lost.
2 hours of premium M$ phone support - they said forget it,
it's toast, throw away the hard disk.
10 minutes of Knoppix boot, files full accessable, copied
off to the network.
All better.