So maybe you have searched all over online and still can't play Fallout 3 when you hit start, in this guide I will tell you what worked for me.

First, open the files app and navigate to C:\Program Files (x86)\Steam\steamapps\common\Fallout 3, then you want to find an exe file titled "FalloutLauncherSteam.exe" and rename it to "FalloutLauncher.exe", when you first try to load it again steam will tell you the file is missing, just click ok and run it through steam again, steam will act like it had an update and quickly "update" it, then click start game and it should load the launcher, in the Fallout launcher it should detect hardware and set the info (this will happen every time you get into the launcher, thanks Bethesda!) and hit start, it will open the launcher again and detect hardware and again set settings (also will happen every time, thanks again Bethesda!) and then you need to hit start and if everything goes well, your screen will go black quickly and load Fallout 3.

The last part of this guide, a bonus tip, you can go onto the properties of Fallout 3 and in the launch options paste ""C:\Program Files (x86)\Steam\steamapps\common\Fallout 3\Fallout3.exe" %command%" (without first and last quotations). This will fully skip the launchers and kick you straight into the game, this also works similarly with other games that include launchers, to install mods, either remove this from the launch options temporarily, or boot the launcher's exe file and add it through there. Happy gaming!