My install was screwed up too. I installed a fresh copy of .419, downloaded the .591 .rar file, copied all the new cods and pasted them over the .419 Java. I got all kinds of java errors and screen went blank etc. etc.
Just for shits and giggles, open your shrink an operating system and see if you shrunk out your default backgrounds. I did it once before and from what your describing, you may have done the same thing