Dear Ethan Crowley,
Thank you for reaching out.
If your computer can no longer automatically install updates and the Check for updates function has stopped working, the issue is commonly related to the Windows Update components, the Windows Update service (wuauserv), or a corrupted update cache. Microsoft recommends starting with the built-in Windows Update Troubleshooter available under Settings > System > Troubleshoot > Other troubleshooters > Windows Update, as it can automatically detect and repair many update-related issues. Troubleshoot problems updating Windows
If the problem persists, verify that the Windows Update and Background Intelligent Transfer Service (BITS) services are running and set to their default startup configuration. It is also worth resetting the Windows Update cache by recreating the C:\Windows\SoftwareDistribution folder, which is a common cause of update detection failures. Troubleshoot problems updating Windows
To provide a precise diagnosis, please let us know which version of Windows you are using (winver) and whether you receive a specific error code when opening Windows Update or attempting to check for updates. This information will help determine whether the issue is related to Windows Update services, component corruption, group policy restrictions, or a failed update installation.
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Kind regards,
HL.