Launch4J Error Fix: Need Help?

Yeah your told that you need to change it from a .EXE to a .JAR but mine is already .JAR is still like that adding .jar to the name doesnt change anything thats only for the Windows XP fix still looking for a Windows 7 fix...It seems there is other programs doing the same job as LAUNCH4J like 1's called something like SmoothJ they both have different advantages but apart from image formats LAUNCH4J is better especially for minecraft and the solutions wont work for everyone...also the video is now unavaliable...i advise for anyone with this error to check WWW.JAVALOBBY or check the offical java website...still looking for a solution...if you have the problem its likely other java applications wont work and MCpatcher wont work...Im really unlucky gettting this...my computer hates me