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. Run the System File Checker tool (SFC.exe)

The Program Install and Uninstall troubleshooter helps you automatically repair issues when you're blocked from installing or removing programs. It also fixes corrupted registry keys. First, you'll need to download the troubleshooter. Download troubleshooter.

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. You can try to repair a program first, if it's just not running correctly.

Use this app to try to recover lost files that have been deleted from your local storage device (including internal drives, external drives, and USB devices) and can’t be restored from the Recycle Bin.

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.

How to change the default apps. In the Settings app on your Windows device, select Apps > Default Apps, or use the following shortcut: Default Apps. To change a default app, you can do either of the following: Set a default for a file type or link type.

Configure startup applications from File Explorer. Fix the error: We couldn’t find this app. If you see the massage We couldn’t find this app as an app title in Settings, the app could be on a removable drive, a network drive, or the path to the app might not exist.

To do this, delete all the NI files in the NativeImages directory and then run the ngen update command to regenerate them. Describes how to mitigate large numbers of block events that collect in the MDATP portal.

How malware can infect your device. Microsoft security help and learning. If you suspect that your device may have malware you should have Microsoft Defender run a scan. Here's how to do that on Windows, Mac, or Android.

If you accidentally delete a file or folder in OneDrive, you may be able to recover it later from the OneDrive recycle bin, and if you're a Microsoft 365 subscriber, you can even restore your entire OneDrive if something goes wrong.