Hi Andrew,
We appreciate your interest in Windows 10.
Have you made any changes to the computer prior to the issue?
Kindly follow the below steps and check if it resolves the issue.
Step 1:
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Open the Start menu, type
Turn system icons on or off in the search bar and click on Turn system icons on or off from the search bar results.
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Turn the Action center on.
If the issue persist, follow the below step.
Step 2:
Follow the below steps and check whether you are able to access Action center.
1. Open the Task manager. Here’s a tip: Press CTRL+Shift+ESC.
2. Click File > Run New Task.
3. Make sure you have a check mark beside “Create this task with administrative privileges”.
4. Type CMD.
5. Type all the following four commands one by one at the CMD prompt:
dism /online /cleanup-image /restorehealth
sfc /scannow
powershell
Get-AppXPackage -AllUsers |Where-Object {$_.InstallLocation -like "*SystemApps*"} | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
6.Close the CMD window.
I hope the above information helps. Kindly let us know if you need any further assistance with Windows. We are glad to assist you.
Thank you.