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Use the System File Checker tool to repair missing or corrupted system ...
If some Windows functions aren't working or Windows crashes, use the System File Checker to scan Windows and restore your files. Though the steps below might look complicated at first glance, just follow them in order, step-by-step, and we’ll try to get you back on track.
Repair Outlook Data Files (.pst and .ost) - Microsoft Support
Data files. Repair Outlook Data Files (.pst and .ost) Outlook for Microsoft 365 Outlook 2021 Outlook 2019 Outlook 2016. Guided support in your browser can provide digital solutions for Office problems. Try guided support. You can use the Inbox Repair tool (SCANPST.EXE) to diagnose and repair errors in your Outlook data file.
Applies To: Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016
Using System File Checker in Windows - Microsoft Support
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.
Update drivers manually in Windows - Microsoft Support
Select Update Driver. If Windows doesn't find a new driver, you can try looking for one on the device manufacturer's website and follow their instructions. Reinstall the device driver. In the search box on the taskbar, enter device manager, then select Device Manager.
Download and install or reinstall Office 2019, Office 2016, or Office ...
The install begins. Your install is finished when you see the phrase, "You're all set! Office is installed now" and an animation plays to show you where to find Office applications on your computer. Select Close. Follow the instructions in the window to find your Microsoft 365 apps.
Applies To: Office 2019, Office 2016, Office 2016 for Mac, Office 2013
Use the Office offline installer - Microsoft Support
Use the Office offline installer to install Office 2016 or Office 2013 if you don't have an active Internet connection or you're having problems with slow speed or unreliable connections.
Applies To: Office 2021, Office 2019, Office 2016, Microsoft 365 for home, Office for business, Office 365 Small Business, Microsoft 365 admin, Office 365 operated by 21Vianet, Office 365 operated by 21Vianet - Small Business Admin, Office 365 operated by 21Vianet - Admin, Office 365 Germany - Enterprise, Office 365 Germany - Enterprise admin
Download and install or reinstall Microsoft 365 or Office 2021 on a PC ...
If you already redeemed a product key, you're simply reinstalling the apps, or you know you have an assigned license through work or school, you can skip ahead and go to the section sign in to download and install Microsoft 365 or Office.
Applies To: Office 2021, Office 2021 for Mac, Office 2019, Office 2019 for Mac, Microsoft 365 for home, Office for business, Office 365 Small Business, Microsoft 365 admin, Office 365 operated by 21Vianet, Office 365 operated by 21Vianet - Admin, Microsoft 365 for Mac, Office 365 Germany - Enterprise, Office 365 Germany - Enterprise admin
Troubleshooter for repairing Windows Update system files and settings
You can check troubleshooting history to see if this troubleshooter has been run on your device by going to Start > Settings > Update & Security > Troubleshoot > View troubleshooting history and looking for the following: Windows Update troubleshooter. Automatically repair system files and settings to improve device security. Next steps.
Defragment your Windows 10 PC - Microsoft Support
Defragment your Windows 10 PC - Microsoft Support. Windows 10. Optimizing your drives can help your PC run smoother and boot up faster. To optimize them: Select the search bar on the taskbar and enter defrag. Select Defragment and Optimize Drives. Select the disk drive you want to optimize. Select the Optimize button. Defragment your Windows 10 PC.
How to use the PC Health Check app - Microsoft Support
How to open PC Health Check. In Windows, use Search on the taskbar to search for “PC Health Check,” then select it from the list of results. If a PC Health Check update is available, you can quickly install it for the latest version.