Best way to answer that is, do you have a 64-bit OS? If you do, just head on over to Oracle.com (direct link here,) where they host the official Java repositories. The JRE (standard Java Release Edition) will do just fine for you--it's the Windows x64 that you want (I believe.)
If not, bast you can do is update your 32-bit versions (which is listed as a x86 version--odd, I know. It's Oracle, coming from someone who looked at their proprietary Oracle SQL language and shook his head at its weirdness.)
Hrmm... better update my version, too.