Hello, I'm a new Mac user (MacBook Air) and as a new Mac user I shouldn't have installed a beta of 10.7.2 (11C55)... because now I have no idea how to upgrade to the final version of 10.7.2. Does anybody know what I could do to upgrade to the final version? My second question is about a window that pops up every time I boot up my Mac. It's a window that says "MacOS" and it's pretty annoying to have to close it every time. I believe this started popping up after I installed Steam for Mac. Do you know how I could stop this from happening? Thank you very much for your help.