another "is this video card good enough"

I just bought a Dell 2005FPW (wide screen flat panel) and hooked it up to my old computer
(which is 3 years old - but it was the best you could buy at the time).
Is my graphics card adequate? I have a 128 MB "NVIDIA GeForce4 Ti 4600"...
I can't get the max resolution of my monitor with this setup...Is the card the problem or do I need to download any updates, new video drivers, etc.?

To Rehash:
The monitor is brand new - latest and greatest, but the Dell computer I have is an 8200 purchased in Aug. of 2002...

And I did get the DVI and the blue connector to connect to my computer - which one is
better to use?