Trouble connecting to a Dell 2007FP monitor

My office uses Dell equipment so they bought me a Dell monitor to use with my MBP. The monitor comes with cables to connect either using VGA or DVI-D. I connected it to my MBP using the DVI-D cable and connected to the monitor first then the MBP. I cannot get these two to work together.

First, I am trying to mirror the displays and I cannot get the picture on the Dell monitor to fill the screen. While I am able to select separate settings for my LCD and the Dell monitor, no matter what setting I use I wind up with a picture that is the same height on my 20" monitor as it is on my MBP. I have a 20" off brand monitor at home and I have never had this problem, althought on that monitor I connect through the VGA port and use the VGA to DVI adapter.

Second, and more strange is that whenever I connect this monitor I lose my ability to connect to the Internet. I am connecting via airport. I show the same strength of signal but I cannot pull up any web pages at all. No one else in the office is having problems with their Internet and I have isolated it down to the monitor as the cause because as soon as I disconnect it from my MBP I am able to load a web page just fine.

Does anyone know why I would have this kind of compatibility problem with this Dell monitor? I have used many other brands of monitors before and I have never experienced these issues.