I want to replace my hard drive in another computer. The hard drives don't look too pricey, around a 100 bucks. I doubt that old cheap computer had an expensive hard drive in it? A new hard drive doesn't have an operating system, does it? Unless you use some type of linux, a new operating system is around 200 bucks for windows, correct? Can I do this for less than 300 bucks. I don't know that much about linux. thanks