Here is the fix for this error:
![](https://i.imgur.com/Fb7DKv1.jpg)
1. Go to start menu, search for regedit and run.
Make sure you back up your registry!!! Go to File -> Export and under Export Range, select 'All', name it and press save.
2. Navigate to these keys and delete the folders with \command:
Code:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\prlauncher-login\shell\open\command
HKEY_CURRENT_USER\SOFTWARE\Classes\prlauncher-login\shell\open\command
Doing that makes the logging in work. If it doesn't work, try deleting the prlauncher-login folder.