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.

If you delete files or folders that you're syncing, you can restore them from the Windows recycle bin on your PC. To put your Windows recycle bin on your desktop, see Show or hide the Recycle Bin. The information in this article also applies to OneDrive (for work or school) files.

Restore deleted files and folders or restore a file or folder to a previous state. Navigate to the folder that used to contain the file or folder, right-click it, and then select Restore previous versions.

Simply, it's a GUID (globally unique identifier) that's automatically generated for every request that the SharePoint server receives. It's unique to each request, not each error. However, when an error occurs, the error message contains the correlation ID that was valid for the request at the time.

A BitLocker recovery key is needed when BitLocker can’t automatically unlock an encrypted drive in Windows. This key, which is a 48-digit number, is used to regain access to the drive. You might be prompted for the BitLocker recovery key during startup, due to a security risk or hardware change:

Learn what OneDrive error codes and messages mean and what to do about them.

Solution 1 - Update Office. Make sure Office is updated to Version 2102 (Build 13801.20808) or later. If you're not setup for automatic updates do the following: Note: If your IT admin manages Office updates, you may not be able to do the steps below. Contact your admin for help with this error.

After you install the OneDrive sync app (onedrive.exe) to sync your OneDrive for work or school files, or update your Operating System, you may experience one or more of the following symptoms: You're not prompted for sign-in. No synchronization of files occurs, and no error message is displayed.

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.