Error 0x80073701 on Windows 10 usually means the update could not complete because of a servicing/component issue.
Try these steps in order:
- Check for updates again
- Go to Start > Settings > Windows Update
- Select Check for updates
- Run the Windows Update troubleshooter
- Go to Start > Settings > System > Troubleshoot > Other troubleshooters
- Find Windows Update and select Run
- Follow the on-screen steps
- Run the DISM cleanup command
- Select Start, type cmd
- Right-click Command Prompt and select Run as administrator
- If prompted by UAC, select Yes
- Run:
dism /online /cleanup-image /startcomponentcleanup - Wait for it to finish, then restart the PC
- Try Windows Update again
- Repair system files
- Open Command Prompt as administrator again
- Run:
DISM.exe /Online /Cleanup-image /Restorehealth - If the issue is caused by damaged or missing update files, this can help repair them
- Make sure Windows Update service is running
- Press Win + R, type
services.msc, press Enter - Find Windows Update
- Open Properties
- Set Startup type to Automatic
- If the service is stopped, select Start
- Select Apply and OK
- Restart the PC and check for updates again
- Press Win + R, type
- Check free disk space
- Windows needs at least 16 GB free for a 32-bit OS or 20 GB for a 64-bit OS to upgrade
If it still fails, the documented next step is to get help with Windows upgrade and installation errors.