Hickory: I recently installed this game and it insisted that I install Java. Fine, I already had an older version of Java so I allowed it. Problems then arose: I could no longer double-click on any .jar files (this game included) to execute the code. Just an association hickup I thought, no worries. Wrong. No matter what I did (Control Panel, command prompt, registry directly) nothing seemed to work. So I took to Google -- I was not alone! -- and came across this tiny little utility called Jarfix. Problem solved immediately! It seems that the problem was to do with administrative and user associations. Why installing a newer version of Java should create this insanity in the first place, I have no idea. This little darling saved my sanity.