help!

That wretch Jasmine did SOMETHING to my keyboard, so that the contents of my Internet Screen have been "scootched" up on the physical screen - that is, the top 10% of the contents of the screen have now gone up and out of sight. (This includes the regular Internet toolbars).
I realize the solution is extremely simple. I just don't know it. (Turning off the computer did nothing to reverse the problem).
Any suggestions? It's a PC, Windows Vista.