For Windows 7, there are several places that JRE can be installed. For example, here are the three JREs on my machine. You need to disable auto updates for each JRE.
* C:\Program Files\Java\jre6
* C:\Program Files\Java\jdk1.6.0_25\jre
* C:\Program Files (x86)\Java\jre6
Briefly,
* Go to each JRE home’s bin directory
* Run javacpl.exe program. You may need to run it as an Administrator.
* Click the Update tab and uncheck Check for Updates Automatically.
If you do not see the Update tab, that means the update has already been disabled via registry.
References
* http://mybrainsaver.blogspot.com/2011/07/disable-java-update-in-windows-7.html