Check this out:
http://zorin-os.com/
I've never used it but it looked interesting. Windows GUI, Linux OS. Claims to support gaming as well (Paid Version).
This looks cool - I'm going to give it a try on my spare computer (currently running Windows XP Black Edition). The trouble is, it seems like there have always been promising Linux distros (The first one I tried was Mandrake over 14 years ago, then Ubuntu, and then Linux Mint) but I always hit a roadblock. This one looks to be based on Ubuntu, but with a "look changer" app to make it look like Windows.
The only thing I need it to run right away is Minecraft and possibly Roblox. If I can 't get those working - it's back to Windows...