Method 1: Runfallout 3 as an administrator
Method 2: RunFallout 3 in compatibility mode
Method 3: Editthe Falloutprefs.ini config file
(all the above mentioned methods available in details at: https://promptresolve.com/operating-system/how-to-get-fallout-3-work-on-windows-10/)
If Fallout 3 still doesn’t work or if you are experiencing crashing or experiencing any other issues, then you can install Windows Game Live from the Microsoft official website. There are a few more solutions that you can apply to troubleshoot this problem and also look for the solutions here on can’t reset windows 10