Just bought 4 E6500's (Win XP)with the same issue.  I believe I found the fix. It seems to be caused by the Control Point Connection Manager installed by Dell.  This worked for all 4 of mine: 1. Uninstall Control Point Connection Manager and reboot. 2. Go to Dell support Drivers and Downloads. Download and install the appropriate wirless networking driver for your system.  3. Reboot. The Dell wireless management tool should open on boot. Select the utility and uncheck "Let this tool manage your wireless networks".   You should be good to go. I don't think Dell has the Control Point application working properly yet.
I just got a Dell Latitude E6400 with Microsoft XP Pro from my company.  Whenever I log into any user the control panel automatically launches.  I have checked the start-up folder and msconfig and there is nothing in either that launches the control panel.  (For msconfig I searched processlibrary.com to be sure.  As far as I know this site is reliable.)  I'm guessing it is something in the registry, but I'm not expert enough to be able to figure it out and the web has been of very little help on this subject.  If anyone can offer some advice I'd really appreciate it, as the control panel pop-up is very annoying. In addition to the above, when I log on as administrator the C:\Program Files\Adobe\Acrobat.com folder also automatically opens.  It does not open when I switch to a standard user, then back to administrator the way the control panel does.  I only log in to install programs, so this is less annoying than the first part of the problem, but still something I'd like to stop.  I looked in the same places as above to see if it was there and no luck. Any help would be appreciated.  I imagine I'm not the first person to have this problem, but unfortunately every search combination I tried netted over 14,000 results, and nothing immediate to my issue was in the first few pages.  Forgive me if I'm asking you to repeat information!! Thank you!! Kelly
Control Panel and Acrobat folder Launches on Startup