Attempt to launch Fallout 3 to see if the error persists.
Optionally, you can try compatibility with Windows XP SP3.
Check the drop down box and troubleshoot with different Windows versions.
Select the Compatibility Tab and check the box that says Run this program in compatibility mode for:.
Go to your Fallout 3 install folder within Steam.
Run Fallout 3 in Compatibility Mode - See images below for examples of what this looks like
Select the Compatibility tab and tick the Run this program as an administrator box.
Right click the Fallout 3 application file and select Properties.
Under the LOCAL FILES tab, click Browse LOCAL FILES.
Default location: C:\Program Files (x86)\Steam\steamapps\common\Fallout 3 goty. Step 2: Run Fallout 3 as administrator and in compatibility mode Run Steam.
Go to your Fallout 3 install folder within Steam and locate the executable.
Note: If you are NOT an administrator on your computer, you will not have the Compatibility tab. Run the Fallout 3 Executable as an Administrator
Ensure that the resolution of the game matches that of your display monitors by selecting Options from the Fallout 3 Launcher and selecting the correct resolution under Graphics Adapter and Resolution.
If using dual monitors, disable your second one from your Windows display settings.
Launch the game in Windowed Mode by selecting Options from the Fallout 3 Launcher and ticking the Windowed box under Mode.
Issues associated with launching and playing the game can often be resolved by changing the following display options: To resolve Fallout 3 performance issues on Windows 10, you should first ensure that you meet the game's minimum requirements and you have the latest NVIDIA or AMD graphics card drivers installed.