Windows - Uninstall SOPHOS End Point without the unlock password

Enable the Administrator user (if it's not already enabled).

Reboot your Windows system into Safe Mode.

Login as Administrator

Run services.msc
Search for the Sophos Anti-Virus service and click on it with the right mouse button.
From the context menu, select Properties and then deactivate the service.

Run regedit.
Go to the following location in the registry editor: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Sophos MCS Agent and set REG_DWORD Start value to 0x00000004

Then, go to the following location:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Sophos Endpoint Defense\TamperProtection\Config set the REG_DWORD values SAVEnabled and SEDEnabled both to 0.

Finally, go to the following location:
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Sophos\SAVService\TamperProtection and set the REG_DWORD value to 0.

Reboot the system in normal mode.

Try the uninstall process, it will be need another reboot.