You could go into startup and uncheck Dell Quickset. That may get rid of the tray icon.
Go to start , run then type msconfig then click ok. Click on the startup button.
Check the list for DellQuickSet and uncheck it hit ok and apply. Then restart
your system. A box will come up telling you about selective startup.
Put a check mark in the box that says Don`t show this message again
See if the icon is gone Good luck.
I don't think QuickSet supports a no tray icon option.
However, you can hide it using Windows XP "Inactive icons" option.
Please don't send questions about your issues to me by Private Messages; post them in the appropriate board so everyone can read. Thank you.