Help! Computer is talking to me...

[DP]

Literally. I woke it up this AM and the first thing I noticed was a solid black rectangle around the icons on my desktop that I clicked on and then it would start talking to me telling me the name of the file. Then I would go to my dropdowns and it would say out loud every thing I click on and it's in this electronic voice. Also I noticed that some menu items such as Shutdown are duplicated. What's going on and how do shut it off? As of now I have turned off the sound but this is really crazy.
iMac Core Duo 2.0 10.4.9.