If you still have a product key from Windows 7, 8, or 8.1, you can upgrade to Windows 10 for free. All you need to do is download the Windows Media Creation Tool to get started. Download the Windows Media Creation Tool from Microsoft and select Run. You need to be signed in as an administrator to do so. From the License Terms page, select Accept .
You've likely heard that you can't straight upgrade from Windows XP to Windows 7. You can upgrade from Windows Vista to Windows 7, but not from XP to 7. Some folks who apparently have a pile of operating systems discs have proposed that one could upgrade from XP to Vista, then from Vista to Windows 7, but I think that's insane.Codename Preliminary name Final name Notes Ref Razzle NT OS/2, Advanced Windows Windows NT 3.1: Is also the name of a script that sets up the Windows NT development environment. NT OS/2 reflected the first purpose of Windows NT to serve as the next version of OS/2, before Microsoft and IBM split up. Microsoft used the NT OS/2 code to release Windows NT 3.1.