OSL 2000

Sweet, but what size of harddrive do you need for 100 operating systems? xD

I personally would never require nor use 100 OS's but i suspect if you would like to give it a shot then you can assume 25gb per OS x 100 OS's = 2,500 GB of space. Figure the space currently used in your default OS so if you had a system with at or above 2,500 gb space i assume it might work. However, with 26 letters in the English alphabet and C: already occupied you may only be able to install 25.