You can remove it by simply editing a registry sub key.
1.Run Registry Editor.
2.Go to
HKEY_CLASSES_ROOT\Directory\Background\shellex\
ContextMenuHandlers\
3.Delete the sub key called:
XXX Groove GFS Context Menu Handler XXX
4.In case you want fully remove it from all right click context menu. (Optional)
HKEY_CLASSES_ROOT\*\shellex\ContextMenuHandlers\XXX Groove GFS Context Menu Handler XXX
HKEY_CLASSES_ROOT\Directory\shellex\ContextMenuHandlers\XXX Groove GFS Context Menu Handler XXX
HKEY_CLASSES_ROOT\Directory\Background\shellex\ContextMenuHandlers\XXX Groove GFS Context Menu Handler XXX
HKEY_CLASSES_ROOT\Folder\shellex\ContextMenuHandlers\XXX Groove GFS Context Menu Handler XXX
HKEY_CLASSES_ROOT\AllFilesystemObjects\shellex\ContextMenuHandlers\XXX Groove GFS Context Menu Handler XXX