Question: how to transfer files from window 7 to windows 10?
Answer: If you're running Windows 7 on your old PC, upgrade it to Windows 10. ... 
If you've already been using File History on your old PC, jump to Step 5. ... 
Sign in with your Microsoft account on your old PC. ... 
Plug the portable hard drive into your old PC and then set up File History to save your files onto the portable hard drive.