After reading and working with various disc problems and re-installing windows, several times I have mentioned I clone my drives.
I thought the forum might be interested in a problem that occured on my Vista Desktop the other morning. When I get up and come in, I usually start the Vista PC not my XP PC. This morning I started the XP PC and at a certain point needed a file that was on my Vista PC, so I booted it up. The screen resolution was way out, give me an image that was squished down in the vertical mode making circles oblong. A windows download had redone my video drivers. (Update was on automatic - a mistake)
I attempted to roll back and got a black screen with the monitor image saying resolution was out of bounds. Forcing a reboot, I go the same screen. I turned off the PC, swapped the cables on the two hard drives, rebooted and was on my backup drive.
That night after I got home, I briefly tried a few corrections, gave up and cloned from my back up drive back to the operating drive and went on. Very little fuss very little muss.
Murphy's law is alive in well in computing and a cloned backup is a good insurance policy.