You can probably use your downgrade rights from Windows 8.1 Pro to Windows 7 Pro using the Dell Windows 7 Professional with "SP2" Reinstallation DVD/USB for more details in slipstreaming SP2 into existing media see here: [URL] Then you can upgrade to Windows 10 Pro which will register your systems hardware profile with a Microsoft Product Activation server making your system a "Windows 10 Pro Device": [URL] You can then Clean Install Windows 10 Pro without input of a product key... a "Windows 10 Pro Device" will automatically reactivate when online. Alternatively you can take the Unofficial Windows 10 10130 Upgrade path which will also make your system a "Windows 10 Pro Device": [URL]
Bought 5 of these about 14 mo ago. One wouldn't activate. Dell sent a MB and still wouldn't activate. Couldn't reimage the PC at the time and now I'm out of warranty. Showkeyplus shows Windows 7 OEM marker present in firmware. This came from Dell with Win8 reinstalled. Do I have any resort at this point in getting this to activate without purchasing a new license?
Inspiron 3647 won't activate Win 8.0