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.

Start your PC in safe mode in Windows - Microsoft Support. Windows 11 Windows 10. Safe mode starts Windows in a basic state, using a limited set of files and drivers. If a problem doesn't happen in safe mode, this means that default settings and basic device drivers aren't causing the issue.

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. In the search box on the taskbar, type command prompt , and right ...

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.

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).

Press and hold the CTRL key to open an Office application. 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.

Tap or click Startup Settings. If you don't see Startup Settings, tap or click Advanced options, and then tap or click Startup Settings. Tap or click Restart, and then wait while your computer restarts. On the Startup Settings screen, choose an option. Sign in to your computer with a user account that has administrator rights.

Download. What it fixes. Checks the following Windows security features and enables them if needed. Phishing Filter or Smartscreen Filter. User Account Control (UAC) Data Execution Prevention (DEP) Windows Firewall. Antivirus protection status and updates. Runs on. Windows 7. Windows 8.1. Windows 10. See also. Stay protected with Windows Security.

Windows 7. The Advanced Boot Options screen lets you start Windows in advanced troubleshooting modes. You can access the menu by turning on your computer and pressing the F8 key before Windows starts. Some options, such as safe mode, start Windows in a limited state, where only the bare essentials are started.

Windows 11 Windows 10. PC Health Check app brings you up to date info on your Windows device health, helping you take action to improve your device performance and troubleshoot performance problems. It is periodically updated based on customer feedback to help you make the most of your Windows PC. How to open PC Health Check.