I have Windows 7 64bit OS.
... then use the built-in search function that your OS has, and go find it.
The easiest thing to do is download this:
"Windows 64-bit - zip file includes the JDK 7"
When you run the EXE, it won't prompt for anything, it will just run.
In fact, if you have the JDK properly installed on Windows, the exe won't prompt for the location of Java anymore, so it sounds like you may have an install problem with your Netbeans install?