Elna Tymes and Charles Prael provide instructions for doing what Microsoft chose not to support: doing a software upgrade from Windows 7 from Windows XP without performing a clean installation of Windows 7.One of the most looked-for features in Windows 7 is a software upgrade directly from Windows XP to Windows 7.For more information on this, see Chapter 5, "Application and Data Migration".
Remember: Prior Planning Prevents Poor Performance. Before upgrading a Windows XP system to Windows 7, you should first download the Microsoft Windows Upgrade Advisor from
Upgrading a Windows Vista PC to Windows 10 will cost you.
Microsoft is charging 9 for a boxed copy of Windows 10 you can install on any PC. You might have used — or still be using — the Windows 10 preview as a “Windows Insider.” Microsoft has made some confusing statements, but the reality is that you won’t be able to upgrade to the final release of Windows 10 unless you have a Windows 7 or 8.1 license. However, it seems you can continue using preview releases of Windows as a Windows Insider.
That includes things like Microsoft Office, Firefox, Photoshop, Acrobat, Quicken, your password manager, instant messaging client, and who knows what else.
And that means digging out all the CDs you'll need to install those programs, and figuring out what to do if you the disk has been lost or damaged.