Oracle released a patch for Java today which fixes no fewer than 40 serious security-related issues. If you have Java on your computer, then it's important that you install the patch or that you're already running the most recent version (Java 7, Update 25).
If you don't, it's possible that hackers could gain access to information on your computer.
So here's what you need to do. Firstly, check whether you have Java installed on your PC. The simplest way is to go to the control panel and then look in the Programs and Features section, or Add/Remove Programs.
If you don't have Java, then you don't need to worry any further. But if you do have Java, check that it's version 7 update 25. If it's earlier, the simplest option is to uninstall it. Then head to www.java.com and install the latest version (which includes all today's patches) from scratch.
Of course, you may not need Java at all. You could always uninstall it and then wait for a program to complain that it can't run without Java. If no such complaints are forthcoming, there's no need to reinstall Java at all.
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