The sfc /scannow command will scan all protected system files, and replace corrupted files with a cached copy that is located in a compressed folder at %WinDir% \System32\dllcache. The %WinDir% placeholder represents the Windows operating system folder. For example, C:\Windows.

Uninstall or remove apps and programs in Windows. There are different ways to remove apps and programs, so if you can't find the one you're looking for, you can try another location. Note that some apps and programs are built into Windows and can't be uninstalled.

If you're looking for Help on specific Excel Add-ins, such as Solver or Inquire, see Help for Excel for Windows add-ins. If you're looking for additional help with Excel add-ins using the COM Add-ins dialog box, see Add or remove add-ins in Excel. Get a Microsoft 365 Add-in for Excel.

Install Microsoft 365 2019 or 2016 on a PC. Remember a one-time purchase version of Microsoft 365 is licensed for one install only. Depending on your browser, select Open file (in Edge or Internet Explorer), Setup (in Chrome), or Save File (in Firefox).

Windows 11 in S mode is designed for security and performance, exclusively running apps from the Microsoft Store. If you want to install an app that isn't available in the Microsoft Store, you'll need to switch out of S mode. Windows 11 in S mode is only available in the Windows 11 Home edition.

Download and install or reinstall Microsoft 365 or Office 2021 on a PC or Mac. Set up Office apps and email on a mobile device. Small business help and learning. Learn how to download and install apps you need from your Microsoft 365 business subscription.

To help you keep your device secure, Windows Security monitors your device for security issues and provides a health report, which appears on the Device performance & health page. The Health report alerts you to common issues in four key areas and offers recommendations to remedy them.

How to help keep your Microsoft account safe and secure. Change or reset your Windows password. Accessing the account of someone who has died. Learn how to reset or change your Microsoft account password. Get help with a forgotten Microsoft account password.

You can set up an authenticator app to send a notification to your mobile device or to send you a verification code as your security verification method. You aren't required to use the Microsoft Authenticator app, and you can select a different app during the set up process.

For technical support, go to Contact Microsoft Support, enter your problem and select Get Help. If you still need help, select Contact Support to be routed to the best support option. Admins should view Help for OneDrive Admins, the OneDrive Tech Community or contact Microsoft 365 for business support.