Add to the above answers:
Don't let the word 'developer' scare you; Ubi is a stand alone computer Operating System, with plenty of built-in open source software like Firefox, Open Office, and more. It does everything a PC does, except robust gaming. As noted, Ubi is not a gamers paradise.
You can (and should) use Ubi for all Internet work...then you won't have to babysit and constantly spend time trying to defend against or repair malware damages: which means more time for gaming or whatever.
Try a 'live' version, which runs inside Windows. This arrangement has inherent slowness, but you will get an idea of how things work, such as the file/applications/resource locations.
Later when you decide you want a more permanent (and faster) method, use a "dual boot", then you can have the best of both worlds.
Have a look: http://www.psychocats.net/ubuntu/installing