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Use the System File Checker tool to repair missing or corrupted system ...
If the steps above don't work, you may need to reinstall Windows. For more info, see Windows 10 recovery options. Describes how to use the System File Checker tool to troubleshoot missing or corrupted system files in Windows 8.1, Windows 8, Windows 7 or Windows Vista.
Repair Outlook Data Files (.pst and .ost) - Microsoft Support
Select the Data Files tab. All Outlook Data Files (.pst) and Offline Data Files (.ost) are listed along with the name of the account the files are associated with. If you cannot open your Outlook data file or suspect that the file is damaged, use the Inbox Repair tool (scanpst.exe) to repair errors in the file.
Applies To: Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016
Using System File Checker in Windows - Microsoft Support
Windows 11 Windows 10. System File Checker is a utility in Windows that checks for problems with files on your computer. To run it, follow these steps: Make sure you've installed the latest updates for Windows, and then restart your machine. To find out more, read Update Windows.
Start your PC in safe mode in Windows - Microsoft Support
Press the Windows logo key + R. Type msconfig in the Open box and then select OK. Select the Boot tab. Under Boot options, clear the Safe boot checkbox. Find out how to boot into safe mode in Windows from Settings, the sign-in screen, and a black or blank screen.
Open Outlook in safe mode - Microsoft Support
1. Right-click the Start button, and click Run. 2. Type Outlook.exe /safe, and click OK. Tip: If Windows can't find Outlook.exe /safe, try using the full path to Outlook (for example C:\Program Files\Microsoft Office\OfficeXX, where XX is your version number).
Open Office apps in safe mode on a Windows PC - Microsoft Support
Use the /safe option to open an Office application. If you can't start a Microsoft Office application in Office Safe Mode or you have recurring problems opening applications in normal mode, you can try to repair Office. For more information, go to Repair an Office application.
Applies To: Office 2021, Office 2019, Office 2016
About the Microsoft Support and Recovery Assistant
The Microsoft Support and Recovery Assistant works by running tests to figure out what's wrong and offers the best solution for the identified problem. It can currently fix Office, Microsoft 365, or Outlook problems.
Applies To: Outlook for Microsoft 365, Office 2021, Office 2019, Office 2016, Microsoft 365 for home, Microsoft 365 admin
Install Quick Assist - Microsoft Support
Do you need some help installing Quick Assist? For the best experience, download and install the new version of the Quick Assist app from Microsoft Store. If you have problems installing Quick Assist, here are some steps to try to get it installed and working properly. Install the new app. Open the new app. Pin Quick Assist.
Automatically fix Windows security issues - Microsoft Support
Follow these steps to automatically diagnose and repair Windows security problems by turning on UAC, DEP protection, Windows Firewall, and other Windows security options and features. Select the Download button on this page.
Use System Restore - Microsoft Support
Windows 10. Use System restore to make restore points when you install a new app, driver, or Windows update, and when you create a restore point manually. Restoring won’t affect your personal files, but it will remove apps, drivers, and updates installed after the restore point was made. To go back to a restore point: