Why is my screen smaller now?

I updated my Vista with 2000 and now the home screen(all screens) is smaller than allowed and I can't unlock i

• What I am trying to say is now when I turn the computer on the picture doesn't fill the screen so there is a black border than shows on the monitor and I can't use the keys on the bottom of it but when I click on of them it briefly says it is locked. How do I unlock it and maxinize the screen to where it fits the monitor as it did before

• Answer:

  You need to turn the resolution up, and why did you upgrade to 2000 from Vista, im suprised it even boots.. Turn the resolution up...