NB Communtiy Docs: Troubleshooting NetBeans Startup
What if you have accidentally deleted or lost your JDK installation? You cannot ofcourse continue using NetBeans without the JDK. So what to do?
Uninstall and re-install? Nooooo! There is an easy way out and Varun Nischal shows you how in his doc at http://wiki.netbeans.org/TaT_TroubleShootNBStartUp
I am sure you will find it very useful!
How about sharing a cool tip with us?