If you are having trouble launching your game on PC or are experiencing random crashes, Please thoroughly attempt all steps. 
 
Minimum System Requirements
Confirm your PC build is actually capable of running the game.
 
The game’s minimum requirements are:
 
OS: Windows 10
RAM: 8GB
CPU: Intel Core i3-4170 or higher.
GPU: Nvidia GTX 650Ti or AMD R7 250X.
The recommended system requirements are:
 
OS: Windows 10
RAM: 12GB
CPU: Intel Core i7-3820 or higher.
GPU: Nvidia GTX 970 or AMD R9 290X.
If you have an on-board graphics processor be sure to set priority to PCI-E > PCI > Int.Graphics/Int.GPU in BIOS.
 
Run MemTest to rule out any RAM related issues
 
Administrator Account
Log in to Windows 10 with a local Administrator Account. This fixes the majority of cases reported.
 
Check for Updates to Windows 10
Always ensure that you have the latest updates to Windows 10 by clicking Start and typing 'Updates' in the search box.
 
Here is the updated Windows assistant: https://support.microsoft.com/en-us/help/3159635/windows-10-update-assistant
 
Once you've updated, perform a complete shutdown and restart your machine.
 
Microsoft Store and UWP game reset
Make sure all to set your game to the highest priority in Task Manager.
 
Windows > Settings > type Apps & Features > title > Advanced Options > Reset
 
Software
The game does not explicitly support and may even see certain applications/software as a conflict or threat and as such refuse to run, or run with crashes.
 
Disable ALL background software or applications including, Antivirus, Firewalls, and any FPS boosting or monitoring software.
 
Forza Horizon 4 will not boot if you are using any of the following virus checkers.
 
Trend Micro Maximum Security
Comodo Antivirus
Sophos
Emisoft Anti-Malware
Avira
Avast
Bitdefender Firewall
The following list of software applications can cause Forza Horizon 4 to either fail to launch or crash while playing. Please make sure you either disable or uninstall to ensure successful gameplay.
 
Logitech G Hub
MSI Afterburner / Riva Tuner Statistics Server
EVGA Precision
OBS
Xsplit
Discord
MacType
Warsaw Banking App
Wallpaper Engine
A-Volute Sound studio
Nahimic Audio
Sonic Audio
If you are using OBS, Xsplit, or any other streaming programs, please set your source to display capture. 
 
We would suggest disabling Game Mode in Windows and close any overclocking, hardware monitoring, streaming, recording, and any nonessential apps while you play the game.
 
Deactivate Windows Defender
Open Start. . ...
Open Settings. . ...
Click. Update & Security. ...
Click Windows Security. This tab is in the upper-left side of the window.
Click Virus & threat protection. ...
Click Virus & threat protection settings. ...
Disable Windows Defender's real-time scanning.
Set game priority to high
Turn off any overlays
Turn off any extra Power monitoring software
MSI DragonCenter
RyzenMaster
Gamefast from Dells Killer Control Center
Any software installed that may be adjusting or monitoring power settings
Then, make sure that your Power settings are correct
 
Control Panel > Hardware and Sound > Power Options
Change to High Performance
Perform a Full Shutdown (not restart).
?
 
 
 
Hang or Crash when Suspending and Resuming [Windows 10]
Make sure you have not disabled Forza Horizon 4 as a background app.
 
Click the Windows button on your PC
Open Privacy
Scroll down to Background Apps on the left-hand side. 
Scroll down to Forza Horizon 4 and select the slider to turn it ON.
Downloading with current Account from Microsoft store
Open the Microsoft Store, then in the top right corner click on the profile picture.
If you have multiple accounts signed in, sign out of all of them but leave the email account linked to the game's purchase signed in.
Next, in the Microsoft Store download any free app at all.
Then try playing the game again through the Microsoft Store 'Library' page.
Disabling Development Mode
Press Windows + R.
Type Powershell and hit enter.
Copy and paste the following into the Powershell window and press enter.
Get-AppXPackage | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\AppXManifest.xml”} 
 
Reboot your PC. 
 
Make Sure the Time/Date on your PC is Correct
Right click on the clock on your start menu.
Select Adjust Date/Time.
Untick then retick 'Set time zone automatically'.
Reboot your PC.
Missing/Corrupted files 
The game may have encountered an issue with a recent update (Windows, Drivers, Content) and refuses run with crashes or missing updates.
 
Ensure you have the MOST recent Windows 10 update
Make sure your Graphics Card is updated with the latest patch, after windows update.
Reset Store and Application - Windows>Settings>Applications>title>Advanced Options>Reset
Full re-installation of the title
VR/Windows Mixed Reality Headsets.
We are currently investigating an issue regarding Forza Horizon 4 crashing when using VR/Windows Mixed Reality Headsets. Please make sure you have these unplugged when attempting to launch and play Forza Horizon 4. 
 
If you are still having an issue after you've tried these, please submit a ticket using the option below and attach your event logs and DXDIAG.
 
Instructions on how to get your event logs:
 
Try to launch the game.
Right after the splash screen closes you will want to type Event Viewer into the start menu and press enter
Select Windows Logs then Application. 
Select any warning or error messages to see if its related to Forza Horizon 4 (or the title of the game you are going to submit a ticket for).
If so, you will want to select 'Save Selected Events' from the Actions on the right hand side.
Run the Microsoft Tool
Go to the link and save/run the tool. Follow the on screen instructions to troubleshoot/fix your issue.
 
http://go.microsoft.com/fwlink/p/?LinkId=271185
 
Reinstall Microsoft Visual C++ programs
Press the Windows Key + R, appwiz.cpl and then press Enter.
Locate the Microsoft Visual C++ programs in the list.
Select each entry and then click Uninstall.
Download a fresh copy of Microsoft Visual C++ Runtime from here and then install it.
Reset the Microsoft Store
You can use the steps below to refresh the Microsoft Store which will clear the cache and refresh your library permissions. This fixes the majority of the cases.
 
Close the Windows Store app if you have it open.
Click Start and type 'WSRESET', without the quotes.
Right click on the command and click 'Run as Administrator'. If the Windows permission box appears, click 'Yes' or 'Run'.
A black MS Dos screen will appear for a few seconds. Wait for it to disappear and the Store will automatically open.
Attempt to Install the Forza title.