A:AnswerCheck out Belarc Advisor, free software that searches for key codes. It's rated pretty high and supposedly safe. Of course do check it out for relative safety as you would with anything you install on your computer..
A:AnswerThis is a full retail version and full retail gets customer support, OE install not so much. I do not think it has any user guide on the drive but Microsoft web support should have all the info you need.
A:AnswerFor license purposes. In other words so you can’t keep passing code around. You can install it on a thousand computers, but only one going be licensed. You can by a bulk license package. It’s going cost you.
A:AnswerYou can install as often as you want but can only be operating on one pc at a time. So, if your mobo breaks, you can install or use it again on the the new mobo whereas if you have an OEM version, you have to buy a new product license.
A:Answeri believe its plausible. however, you cant go from windows xp to windows 10. You would have to go thru steps. first windows 7 and so on. of course windows 10 pro would not be free.