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Here's how to Fix Msosync.exe error on Windows.

Here are some troubleshooting steps to fix msosync.exe errors on Windows:

- Run SFC and DISM scans to check for system file corruption. Open command prompt as admin and type 'sfc /scannow' and 'DISM /Online /Cleanup-Image /RestoreHealth' to do this.

- Update Windows and any pending Windows updates. Msosync errors can occur due to outdated system files.

- Update or reinstall Microsoft OneDrive. Msosync is tied to OneDrive and errors can occur if it is outdated.

- Uninstall problematic Windows Updates or Program installs. If any were done recently before the errors began, uninstalling them may help.

- Reset User Profile folders by renaming C:\Users\Username folder, logging in to recreate profile and copying back data.

- Delete the msosync.exe file located at C:\Windows\System32 and reboot to rebuild it.

- Run antivirus scans to check for and remove any potential viruses or malware.

- Change the Startup type of the Background Intelligent Transfer Service to Manual or Disabled if msosync loads at startup.

- As a last resort, try repairing or resetting Windows which will replace corrupt os files. Backup data first.

These should help troubleshoot and resolve any msosync.exe issues you are facing on your Windows computer.