Netbeans would not find compatible jdk while installation while JDKs are located at C:Java and the files are:
From NetBeans Installation Instructions
The default location in Windows is C:/Program Files/Java/jdk1.7.0_10 or similar.
If your JDK is at C:/Java you just have to:
- re-install the JDK under the default Netbeans location, or
- specify your custom location during the installation wizard