My Dock disappeared, how can I fix it?

I have a Mac Powerbook G4, it's running in a 4.1 or 4.0, and I have been having a lot of technical difficulties. Awhile back, I downloaded a program, which I think took up too much space, and, well, I had already killed the battery, so when my cat bumped into the charger (It's very fickle, I have to have it on one of those things that lay flat and have all the holes in it, the name slipped my mind) and it shut my computer off while the program was being downloaded. I was pissed, and when I turned my computer back on, my dock was gone and none of my programs would open. After a week or so, I could open a few programs, and found another way to delete things. I deleted the program and a few other things I didn't need, but my dock is still gone!! I don't have a lot of things on my computer, and only have one other account, which has nothing. Does anyone know what the problem could be? I can't open up the "About this Mac" option under the apple, so if you need any other information, I might not be able to supply it. Help!!!