I just keep using the operating system my computer has installed on it, unless I have to buy a new hard drive, and I don't have an operating system to install on the new hard drive because I don't have the money for it, and then what I would do would be to download one of those free operating systems from the internet (the ones that are literally free, not the pirated ones out there) and then install it on the computer through the optical drive. If my next computer comes with Windows 8, I will use it, but I wouldn't install an extra operating system in my computer when I already have one. Personally I think it's a waste of hard drive space, especially those beta OS's. The beta of anything never, ever works well. That's why I wait for the full versions to come out.