Can you post the exact errors you are getting?
One thing you may want to try is use a fresh userdir:
http://blogs.sun.com/karthikr/entry/jse_directories
Also:
- You may want to checkout the tutorials at http://www.netbeans.org/kb/index.html :
http://www.netbeans.org/kb/55/javase-intro.html
- You may want to subscribe to nbusers@netbeans.org forum (http://www.netbeans.org/community/lists/top.html) .