Upgrade from Windows 10 to Windows 11 on an old PC.
Upgrade from Windows 10 to Windows 11 on an old PC.
Yes, you can. If your Windows key is retail rather than OEM, it should function properly. To determine the type of key on your system, open Command Prompt and enter "slmgr /dli" (without quotes). This will display the key details used on your current machine. You might consider transferring your old OS drive to the new setup, but if there are significant differences—like switching from Intel to AMD or from Radeon to NVIDIA, or changing the motherboard brand—it’s advisable to perform a fresh installation unless you plan to manually update drivers.
P.S. If you already have a new storage drive for the OS on the new machine, that works too. You can still download and install a fresh Windows version and handle activation afterward. If you lack the original product key, use Microsoft’s Activation Troubleshooter on your existing account to move the license from your old rig to the new one, provided you already have a Microsoft account linked to your Microsoft ID (not just a local account).