Yes, you can install it on a computer and yes you can have two OS's on the same hard drive. That is what I use. 
~makosanders gave me a rundown on it and now im gonna go learn ^^ once I get linux, pirated or otherwise (they wouldnt get a dime out of me anyways, I dont have a dime to give.) Im gonna use you skin, it reminds me of the old days for some reason, and it reminds me of when dot hack sign was a good game, I have only one game for my ps2 and thats it, I felt nastaulgic or however you spell it, sat down, fired it up and was disgusted by the repetitive crap v.v sucks, anyways, once again, nice ^^