@WackyOldMan
Removing the launcher folder may help in resolving the invisible launcher issue. Please follow the troubleshooting steps below.
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@WackyOldMan
One more troubleshooting step you can try is rebooting the PC into a selective startup. This will disable third party software running on the PC. Open the ESO Launcher while under the selective startup and test if the issue persists.
@WackyOldMan
One more troubleshooting step you can try is rebooting the PC into a selective startup. This will disable third party software running on the PC. Open the ESO Launcher while under the selective startup and test if the issue persists.

<?xml version="1.0" encoding="UTF-16"?>
<Task version="1.2" xmlns="http://schemas.microsoft.com/windows/2004/02/mit/task">
<RegistrationInfo>
<URI>\Kill ESO Launcher</URI>
</RegistrationInfo>
<Triggers>
<EventTrigger>
<Enabled>true</Enabled>
<Subscription><QueryList><Query Id="0" Path="Security"><Select Path="Security">
*[System[Provider[@Name='Microsoft-Windows-Security-Auditing'] and (band(Keywords,9007199254740992)) and (EventID=4688)]]
and
*[EventData[(Data='D:\Games\ESO\The Elder Scrolls Online\game\client\eso64.exe')]]
</Select></Query></QueryList></Subscription>
</EventTrigger>
</Triggers>
<Principals>
<Principal id="Author">
<LogonType>InteractiveToken</LogonType>
<RunLevel>HighestAvailable</RunLevel>
</Principal>
</Principals>
<Settings>
<MultipleInstancesPolicy>IgnoreNew</MultipleInstancesPolicy>
<DisallowStartIfOnBatteries>true</DisallowStartIfOnBatteries>
<StopIfGoingOnBatteries>true</StopIfGoingOnBatteries>
<AllowHardTerminate>true</AllowHardTerminate>
<StartWhenAvailable>false</StartWhenAvailable>
<RunOnlyIfNetworkAvailable>false</RunOnlyIfNetworkAvailable>
<IdleSettings>
<StopOnIdleEnd>true</StopOnIdleEnd>
<RestartOnIdle>false</RestartOnIdle>
</IdleSettings>
<AllowStartOnDemand>true</AllowStartOnDemand>
<Enabled>true</Enabled>
<Hidden>false</Hidden>
<RunOnlyIfIdle>false</RunOnlyIfIdle>
<WakeToRun>false</WakeToRun>
<ExecutionTimeLimit>PT72H</ExecutionTimeLimit>
<Priority>7</Priority>
</Settings>
<Actions Context="Author">
<Exec>
<Command>taskkill.exe</Command>
<Arguments>/IM Bethesda.net_Launcher.exe /f</Arguments>
</Exec>
</Actions>
</Task>