@snood,
In addition to what Cycloptichorn said, you may want to try disabling Java and see if the web sites you frequent keep working. (They very well may -- and you can always change the setting back if they don't.)
To disable Java in Internet Explorer, go to Tools-->Internet Options --> Advanced --> Java (Sun), and uncheck the box[es] in that section.
To do the same in Firefox, go to Tools --> Options --> Content, and uncheck the "enable Java" checkbox.
If you find that your favorite websites keep working even with Java disabled, you can ignore any further requests for updates.