Can't connect 20D to Computer - Help!!

I have had my 20D for about 14 months and have had no problems connecting to any of my 3 computers. Now I am at Disney and my computer can't see the camera. I went to Canon's web site and downloaded the driver. It installs normally but the computer still can't see the camera. By the way, I don't have my Canon CD with me.

I'm in a bit of desperation as I only have 2 gigs of cards and will tap them out quickly. Any help would be greatly appreciated.