I’ve fixed this problem simply by updating windows 7 past SP1 and when that fails I’ve installed the convenience rollup etc. but when those failed me this is what worked.
Before using the Windows 10 Upgrade Assistant, perform these steps:
- set Windows 7 updates to “Never install updates“, (control panel ->updates).
- Stop the update service by right clicking on the command prompt, and choose “Run as administrator“.
NET STOP WUAUSERV
It should say: “Windows update service is stopping….windows update service is stopped.“
After completing the above steps, start the Windows 10 Upgrade assistant, and it should complete.