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To stop Outlook from auto-reinstalling or automatically updating itself, you can follow these steps:

1. Modify Auto Update Settings:

   • Open any Microsoft Office application (like Word or Excel).
   • Go to File > Account or Office Account.
   • Under Product Information, look for Update Options.
   • Click on Update Options and select Disable Updates.

2. Uninstall via Control Panel:

   • Press Windows + R to open the Run dialog.
   • Type appwiz.cpl and press Enter to open the Control Panel's "Programs and Features".
   • Find Microsoft Office in the list, select it, and click on Uninstall.
   • Follow the prompts to remove Office.

3. Check Windows Settings:

   • Go to Settings > Update & Security.
   • Select Windows Update.
   • Click on Advanced options.
   • Under the Restart options, you can disable automatic updates if needed.

4. Group Policy Editor (for Pro and Enterprise users):

   • Press Windows + R, type gpedit.msc, and press Enter.
   • Navigate to Computer Configuration > Administrative Templates > Microsoft Office 2016 (or whichever version you're using).
   • Look for Updates, and configure the settings to disable automatic updates.

5. Registry Edit (use with caution):

   • Press Windows + R, type regedit, and press Enter.
   • Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\office\<version>\common\officeupdate (replace <version> with your version of Office).
   • Find the enableautomaticupdates DWORD and set its value to 0.

Note: Be cautious when editing the Windows Registry and consider backing up important data. Disabling auto-updates may leave you vulnerable to security risks if you do not manually keep your software updated.