I am building 3 computers at the moment. 1 for my dad, one for my sisters, and one for my girlfriend. My current computer has an older copy of windows that I got from a older computer. What is my best bet for installing windows on these computers? I have the dell software, but I know it wont let me activate it on all these comps. Is there a version of windows I can buy that would give me 3 codes? Any help or ideas would be great. Thanks