I have tried to uninstall "Vertical Online Saintment Network" from my computer and when I try to, I get this message "Interner Fehler: Cannot find utCompiledCode record for this version of the uninstaller."
Try using Revo Uninstaller. Even if it can't uninstall the application normally, it will force it to uninstall by wiping out all traces of its presence from the system.
After that, try running AdwCleaner to make sure that there are no leftover rogue registry keys or toolbars in your system.