Out of the blue when I started my laptop (Dell D600, Windows XP SP2) I started getting the following error:
Wireless Configuration
Incorrect MFC DLL version installed on this system; minimum requirement is MFC SP4 Dlls.
The message wouldn’t stop popping up, rebooting didn’t help.
Solution
Google was not much of help there. The best advice found was this; it didn’t help though. Finally I decided to remove Dell Wireless Manager because… it had the same icon that this annoying pop-up 
This helped!
At the moment I can’t do much more about the wireless because my router is in the service. When it’s back I’m going to reinstall the software for wireless and I hope all works grand. If I have any problems I’ll update this post.
The Dell Wireless Manager is (in my opinion) bloated and unnecessary.
I’d recommend just switching the Wireless Zero Configuration back on (start->run, services.msc, right click Wireless Zero Configuration and go to properties, ensure it’s started and set to automatic)
With that enabled, you can go to network connections, and go to the properties of Wireless Network Connection and activate it there. This will let you connect straight from the windows utilities. Only thing you should need is the initial dell driver for the pc to recognize the wireless card, but you shouldn’t need the dell wireless manager (and it’s MFC requirements)
I ran into this same error with a gateway laptop. I had just got done with a format and reload installed all the windows updates and drivers. This error started coming up. I uninstalled the broadcom wireless connection manager from Add or Remove Programs icon in control panel and the error went away. I am still able to use the wireless card as it does not uninstall the drivers just the manager. hope this helps others.
Thank you so much for your post!! I have had this issue for months now — even took it to best buy and they said it would take a while to fix. What a lie?! With your help and recommendation, I fixed this on my own in less than 2 minutes. Thanks again!
Thank you so much Chris for your post. I hve been trying for weeks to remove the prompt, I even bought REGCURE thinking that would fix the problem and it didn’t. I have a gateway also with windows xp. I remove the broadcam from add/remove programs and you were right the prompt went away and my wireless works fine…again Thank you so much,