Back up what you want, or can. Data are more important than programs, which can be re-installed. If you need to back up programs, copy the registry too. Some of the data may be corrupted, but you can sort that out later.

Run scandisk - just check for data integrity, not the physical media. This should "fix" the crosslinked-files errors (by eliminating them as recognizable files). Then try Partition Magic again.

Let us know if that works, okay?

-- Ed