So on some of the systems Quickset may not have a User Interface itself but works through Windows Mobility Center.  You can start Mobility Center either by pressing the Windows Key with X, or going into control panel.  If quickset is installed it may give you Dell centric applets in Mobility Center.  They may be no option to bring up quickset, and it may be hidden as it isn't needed if you are able to open Mobility Center TB
Hi, My Vostro 1500 lost QuickSet from the taskbar; how can I restore it? Thanks,  
QuickSet missing from taskbar