I want to dual boot Windows 7 for gaming but I have no desires to use the OS at all for anything else. No word processing, no internet browsing or anything. Purely gaming. However I don't like the bloat of it. It takes a lot of memory and whenever I install it on a desktop, I'm looking at minimum 18GB. I have a 256GB SSD and I don't want to use it that much. Especially when games take 10-15GB each for installs. Or is it possible to run it off an external? I have a USB 3.0 external and I don't mind it being longer loading times.