So about a year ago I bought a prebuilt PC and eventually used some of its parts in a new PC. Today I replaced all my old parts and put them back into the prebuilt PC. Except the hard drive which I kept because it was 2tb and I bought a new 1tb one for the rebuilt PC. I just finally understtod that my hard drive has windows while the other PC Doesn't. My friend is expecting to buy older one soon and I don't know what to do. He's already gonna pay 350 I can't tell him that he need 80 more dollars for windows. Im really not sure what to do this is giving me great anxiety, someone please help me 🙁 I'm thinking maybe I can get windows 8 if it gets really cheap on Black Friday, does it ever?