To be on the safe side install Java 1.4 unless you've already installed 1.5 Just for a few people they've found 1.5 has caused some side-effects whereas most others have found it to be their glory so to speak. My suggestions to update your install engines is purely being on the safe side & any older install engine issues will most likely affect other apps in the same way. Many if not most install issues are in regards to the install engine problems. That's why updating them will reduce any problems.