With the older versions of Java i.e. update 7 in your case the programmes and features from Vista will not remove it all
Please download JavaRa to your desktop and unzip it to its own folder
[*]Run JavaRa.exe, pick the language of your choice and click Select. Then click Remove Older Versions.
[*]Accept any prompts.
Secunia does run from Java - so to use it you will need to allow it access