I've had to revert my computer back to factory settings because Windows 7 did not detect that I have wireless connection. In doing so, I have to start from scratch. As it stands, the operating system that's in this computer is Windows XP Professional that I never had a key for because this computer was given to me. The version I do have is XP Home but somehow I lost the registration key. I am at my wits end with this. Can someone help me?