At the moment you can't run any Java program, but that probably was what you intended. So why care?
To enable Java again, it seems you'll have to wait for update 6. They come every three months.
I was removing all versions of java from my computer, and all was well until the most recent, Java 7 update 5. This refused to be unistalled. I followed the official instructions here:
After this didn't work i followed this about regkeys:
This failed, so rather stupidly (out of desperation) i have now manually deleted my java folder in the C: drive. I have tried to reinstall multiple times, but each time it comes up with "java already exists, do you want to replace" and yes just sends me back to the same question.
Also worthy of note is I've tried to use Revo unistaller, but seeing as i deleted the regkey it didn't detect it (i assume this is the reason). Also tried "free windows registry repair" and a .jar app i didn't remember the name of.
Basically i'm getting worried and want to know what to do next! Thanks