QUOTE(MasterNe0 @ May 23 2009, 01:45 AM)

Go to Start > Control Panel > Add/Remove Programs, look for Dell registration or something similar and uninstall it.
You can also try disabling it in Start > Run > type in "MSCONFIG" and go to startup and see if you can find anything that related to "dell something". This part is more of trial and error until you find exactly what program the popup is.
This.
If all else fails, you might need a fresh install.