I installed an older version of jdk under program file/java/. So it had "jdk6" and "jre6". I uninstalled it but the "jre6" folder didn't go away. I tried to delete it bbut got "check if disk is full or..." error, can't delete it. when I install a new jdk version it gives error. So when it asked me location for jre I use "jre6new", this time it works. So now I have "jre6" and "jre6new" folders under "java". Will this cause problem ? How does app know which jre folder it is using ?