I built my custom gaming computer few months ago and installed a pirated windows 7. I wasn't sure if it was pirated, but now that i'm in high school, the school website offers free licensed software (like windows 7) and i can download it there for free legally. I have a 128GB ssd and im not sure if i have to delete the pirated windows 7 first or just download the legal online one. Does it overwrite by itself? I only have 35 of 111 GB left on the ssd and im not sure if that is enough. The pirated windows was the ultimate best edition and im not sure what version the school one is. Please help I dont want to wreck things up.