That's the "About"-dialog, which is shown when TortoiseProc.exe is started directly without any command line parameters.
Do you have TortoiseProc.exe maybe put into your autostart folder?
In the start menu, look for "Project Monitor" and start that, then in the dialog of project monitor click on "options" and uncheck "start with windows".
If that doesn't help you need to look for other ways how TortoiseProc.exe could be started on windows logon...