I've worked with Studio Enterprise 8 on my home PC with no problems, but when I'll install it on my notebook, I find that I cannot create standard projects at all. For example in standard projects folder I can see only "Java Project with Existing Ant Script" and that is all :(
If you haven't already, may I suggest installing the newest version. You can find it at
http://dlc.sun.com/netbeans/download/6.0/milestones/latest/
Since the default project types are not listed for you, I have to assume that there is an installation problem. You may want to examine the logs to see if something is there that might further indicate the nature of this problem. The best course of action is to install the newest version.
Also:
http://wiki.netbeans.org/wiki/view/FaqMissingProjectCategories
http://blogs.sun.com/karthikr/entry/jse_directories
As Kris suggested, you may want to consider using NetBeans:
http://forum.java.sun.com/thread.jspa?threadID=5192837
