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you are running Windows, check which browser you are running and TURN OFF JAVA. You can research how to do this for whatever browser (Microsoft Explorer, Google Chrome, or Firefox) you're using by Googling for instructions. If you do not know how to do this (you probably shouldn't be on the web at all), ask someone who does.
If you're using a Mac, you still turn off Java because the same thing can be used to attack Macs.
When you turn off Java it means that certain web sites will not work properly because they depend on it. If you are 100% certain the site is OK, then turn Java on just for that one site.
This will not go away until Java itself is upgraded.