How to trick Fallout 3 in to thinking it is installed?

[Franpa]

The Launcher acts as though the game isn't installed and any attempts to execute the games main EXE file will result in nothing happening. I don't want to have to go and get the disc and reinstall it just to get the game to work. I just want to know what changes the games installer makes to the system so that I can replicate those changes whenever I reinstall Windows without having to actually properly install the game.

Edit I got it working!

Poor example: https://www.regfiles.net/registry/fallout-3-registry

Good example (for 32bit Windows delete the "Wow6432Node\" portions):

Windows Registry Editor Version 5.00

; Fallout 3 registry
; Generated by RegFiles.net
; https://www.regfiles.net/registry/fallout-3-registry

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Bethesda Softworks]

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Bethesda Softworks\Fallout 3]

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Bethesda Softworks\Fallout 3\1.00.0000]

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Bethesda Softworks\Fallout3]
"Installed Path"="E:\\Fallout 3\\"

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\{974C4B12-4D02-4879-85E0-61C95CC63E9E}]
"InstallLocation"="E:\\Fallout 3\\"
"InstallSource"="D:\\"
"ProductGuid"="{974C4B12-4D02-4879-85E0-61C95CC63E9E}"
"DisplayName"="Fallout 3"
"Publisher"="Bethesda Softworks"
"URLInfoAbout"="http://fallout.bethsoft.com"
"RegCompany"="wut"
"RegOwner"="USER"
"NoModify"=dword:00000001
"NoRemove"=dword:00000000
"NoRepair"=dword:00000001
"InstallDate"="20081030"
"Language"=dword:00000009
"DisplayVersion"="1.00.0000"
"Version"=dword:01000000
"MajorVersion"=dword:00000001
"MinorVersion"=dword:00000000
"LogMode"=dword:00000001

Edited November 9, 2016 by Franpa