Be a little careful about what the Win 8 update adviser claims is compatible hardware.
It tells me I have no incompatible/questionable hardware. However, on checking the manufacturer's websites for drivers, there are no Win8 drivers for my HP laser printer as yet.
More pertinently from a DAW point of view it didn't pick up on my M-Audio Midisport s a problem.
It seems M-Audio have yet to release
any Win8 drivers at all. They were very slow off the mark (as in years late) with XP 64bit and Vista 64bit, slow off the mark with Win7 and seem not to have learned from the experience. :-(