Google Earth Problem?

I have been a heavy user of Google Earth for several years. Recently I have a problem that I have spent several hours trying to correct. When I log on to Google Earth, I always start in view that does not allow me to zoom in. The view controls at the upper right side of the screen are there but do not function. The wheel on the mouse works, but as I zoom in I end up looking over the horizon at a very flat angle. I have even tried removing the Google Earth program and reinstalling the program. All these problems are on my computer at home. The office computer works normally. Does anyone know what is going wrong?

Bill Snead
6W