Java SE (Java Platform, Standard Edition)

I have tried a number of times to install java through internet explorer, firefox, and the offline download file. The installation appears to work completing OK. However java apps still don't work and there is no coffee cup in control panel. Sites that require java tell me I need to download it.

If I try to reinstall I get a message saying java is already installed. Java is listed in add / remove programmes. I have uninstalled it and removed every reference of java on the PC and in the registry and I still haven't been able to get it working.

What else can I try?

Thanks