Unable to select Board in tools menu

As stated, I can't select any board in the tools menu. When I go to the drop down menu and hover over "Board," a small grey square, only a few pixels wide, appears. Is this a problem with my environment, my drivers (which I thought I fixed...) or something else? I'll answer any questions I need to to fix this problem.

Do the other menus work correctly? Tools / Serial Port showing any serial ports?

Which Arduino IDE are you using?

I am using Arduino 1.0; some menus are selectable (such as Import Library), others have the same issue (such as Programmer). And yes, I was able to get COM3 to display under Serial Ports.

Sounds like your boards.txt file is missing or corrupt.

Well, downloading another environment (again!) fixed it. Weird...thanks for the help, though!