Most common Java Runtime used by Windows Users

I would like to know, what runtime environment is most commonly installed in Windows machines.
On my website I use applets, however, I do not know which version of Java to use. The latest version has close to zero users who have it installed - and i dont want to anger my visitors with PLEASE DOWNLOAD LATEST JAVA RUNTIME messages. however, what ive been using so far, 1.1.8, is positively ANCIENT!
i have been using that to be compatible with the MVM, but now i need additional features that come only 1.2 onwards... but do people have the JVMs for those versions?
which should be my target compilation for optimum results?
or should i just lump it and stick with 1.1.8?
bear in mind that my target consumer is the average browser who doesnt have any high tech knowledge/inclination
thanks

There are really too many considerations, but here's my take on it....
If you can write it to support 1.1.8 (although, technically, the MS JVM was really 1.1.4, but that won't matter much), then you could do that. Most of the people with the latest plugin versions will be using the plugin to run the applet anyway.
But if you have to do stuff with Swing and some of the newer API stuff for 1.2 or higher, then I personally don't think it's worth the hassle to include the swingall.jar for Swing in 1.1.8, or to try to write/find AWT components that are rich enough to mimic Swing. My feeling is that eventually, you have to move on, cut the cord, whatever.
IE/Windows isn't supposed to have the MS JVM anymore anyway. I haven't heard anything about MS putting it back in. Older systems (98, ME will, XP won't, especially after SP2) will still have it though. Netscape, Opera and Safari users will have to have the plugin anyway (except Netscape 4.x, which I hope no one's still using).
One of the bigger considerations tends (or tended) to be that the JRE/Plugin was a fairly large download. So for dial-up users, that's a problem. For broadband users, that's not a problem at all, and I think I recently saw an article claiming broadband has overtaken dial-up in the US. No idea about other countries though. As mentioned, it can be set up to auto-download and install.
If you are going to go with the plugin, stick with 1.4 for now, as more will have that then have upgraded to 1.5. Those that have, well, it won't matter.
And finally, a lot of PC manufacturers (Dell, certainly) have been installing the JRE 1.4 for the last 2 couple of years anyway.
Some people will certainly say that applets suck and aren't worth doing and there's no user support and all this stuff. Or tell you to try to use Flash, as the plugin has a larger install base.
Flash is certainly something usable, if you want to buy Flash. But there are things that Java can do that Flash can't. There are certainly things Flash is better at then Java applets. So it comes down to what the thing needs to do.

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