Does Steam work on Windows 8?
Solution 1:
http://store.steampowered.com/about/ says that right now Windows 8 is not officially supported. If something goes wrong, you're on your own.
That said, I've been using Steam under Windows 8 for the last few months. There are no issues I'm aware of and pretty much everything I tried worked fine. YMMV
Solution 2:
Nearly all games I've tried on Windows 8 have worked through Steam. With the exception of Crysis 2 and Just Cause 2 as far as I remember. These should hopefully be fixed in due course anyway.