I just updated to Minecraft 1.6.4 and I tried to reinstall forge, but when I double clicked the installer, nothing happens. I have tried a full java reinstall, including deleting registry files, and I have done the jar fix thing. I have both java 7 Update 40 for x32 and x64. When I do double click the .jar, a javaw.exe process pops up for half a second in the task manager. What do I do?