Go to cmd and copy/paste this (EXACTLY this):
java -debug -version > "%userprofile%\desktop\javaDebug.log" 2>&1
Press enter, wait 5 seconds, then attempt to type in the cmd box, if you can't type continue waiting, if you can type, then close the cmd and go to your desktop, then copy paste everything from the "javaDebug" file in this thread.
sau:
http://www.youtube.com/watch?v=-GAIF0dIcOI