Why do people do things like this.

Somebody has compressed the entire C Drive.
The operation supposedly completed. Now after rebooting the PC asks for a network name & password. Once these are entered Drivespace comes back up and displays a mesage that 100% has been completed and the drive is being prepared.

At which point the PC hangs, C+A+D has no affect.

MS seem to suggest that this is pants and that the probable outcome is a reFormat.

Not wanting to do that just yet - any ideas.