Uninstall & Reinstall Issues

How to Fix Microsoft 365 Uninstalls Itself After PC Restart

Maira Mehtab Sep 22, 2026 874 views

Question details

The user experiences an issue where Microsoft 365 installs successfully but automatically uninstalls or disappears after the computer restarts.

Product: Microsoft 365
Device & OS: not provided
Scenario: Restarting the computer after successfully installing the Microsoft 365 suite.
Observed behavior: The Microsoft 365 application completely removes itself from the system upon reboot, and the issue persists even after multiple reinstallation attempts.

Before you start

Verify whether you are using a personal computer or a company-managed device, as organizational policies (such as Microsoft Intune or Configuration Manager) can automatically remove unauthorized or conflicting software upon restart.

Solution 1Recommended

Check and Temporarily Disable Third-Party Cleanup or Security Software

Aggressive antivirus, system maintenance, or deep-freeze software may revert system changes or falsely identify Office files as malicious or bloatware.

Officially supported applications do not intentionally uninstall themselves. This behavior is typically caused by external third-party intervention on the operating system.

Open security settings

Press the Windows key, type 'Security' or the name of your third-party antivirus, and open the application.

Review quarantine logs

Check the protection history, quarantine, or activity logs for any recently blocked or removed Microsoft Office executables.

Disable rollback utilities

If you use system rollback software (like Deep Freeze) or aggressive registry cleaners, temporarily disable them or add an exclusion for the Microsoft Office installation path.

Reinstall and test

Reinstall Microsoft 365 and restart your computer to see if the suite remains installed.

Solution 2

Investigate System Startup and Management Logs

Use the Windows Event Viewer to identify what specific processes are triggering the uninstallation during the startup sequence.

Free Microsoft Office alternative

Try WPS Office if Microsoft 365 Keeps Disappearing

If you are unable to resolve the recurring uninstallation issue with Microsoft 365, consider switching to WPS Office. It provides a lightweight, stable, and completely free alternative that seamlessly handles all your document needs without complex background management software.

1. Download the Installer: Visit the official WPS website and click the free download button.
2. Run the Setup: Open the downloaded executable file and follow the straightforward on-screen installation prompts.
3. Open Your Files: Launch WPS Office and immediately open your existing Word, Excel, or PowerPoint documents with full formatting preserved.

Highly compatible with Microsoft Office formats (.docx, .xlsx, .pptx)Lightweight installation with a smaller footprint on system resourcesDoes not rely on complex background services that conflict with system cleanup toolsFamiliar user interface for a seamless transition

microsoft office alternative - wps office

Frequently Asked Questions

Why does an application like Microsoft 365 disappear after a reboot?

Standard supported applications do not intentionally uninstall themselves. This behavior is typically caused by third-party intervention, such as aggressive antivirus software, automated PC cleanup utilities, or system state rollback programs like Deep Freeze.

Can Windows Group Policy cause Office to uninstall itself?

Yes. On domain-joined or school-managed computers, network administrators may use Group Policies or Mobile Device Management (MDM) tools to enforce strict software restrictions, which can automatically uninstall unapproved versions of Microsoft 365 at startup.

How do I check if my antivirus removed Microsoft 365?

Open your antivirus software and navigate to the Protection History, Activity, or Quarantine section. Look for flagged files related to Microsoft Office or the Office Click-to-Run service that might have been isolated or deleted during the restart process.

Installation & Activation