After installing the native tools i tried to start the remote tool and got this:
Failed to open Database C:\Dokumente und Einstellungen\MYUSERNAME\Lokale Einstellungen\Anwendungsdaten\JoomlaPack Remote\jpremote.s3db:
unable to open database file.
After that i get an access violation.
Path exists but MYUSERNAME has a "ü" in its name.
I guess this could be the reason since my collegues username doesn't have that and he can start it up normally.
I also deinstalled and reinstalled the native tools with no luck.