Best way to add new dual band Extreme to existing b/g network

I've been using a Snow Extreme and b/g Express, but have recently been having dropped/slow connection issues. I think this may be at least partially caused from the many other networks and other wireless devices in the neighborhood - I can see 30 or more networks at times. I've also gotten a new Mini and MacBook, both with n wireless, so I decided to get a new dual band Extreme.
The faster connection speed of the new Extreme is very noticeable on my n capable machines. It also looks like the connection issues I was previously having may have been resolved, but its a bit early to tell for sure.
First problem I've had is with setting up the guest network. If I attempt to set it up wirelessly, I get as far as changing the settings and restarting the Extreme. Once I do, it does restart, but then Airport Utility is not able to find it after restart. I am able to see the main and guest network in my available networks, but I am unable to join either. Once I turn guest off (via ethernet since Utility isn't able to see it wirelessly) I am again able to see it in Utility and connect to the main network. If I try to turn on guest via ethernet, I get an error and it does not restart.
Originally the Snow Extreme was the main and the Express was used for wireless printing. My plan was to use the new dual-band as the main, move the Snow to the printer, and use the Express for AirTunes. But now I realize that I'm only able to print and use Airtunes on the main and not the guest network. Since the Snow and Express are b/g, are they going to slow down the main network? I am seeing these as clients in Airport Utility, which I didn't expect. If so, is there a better way to set this up than what I am attempting to do?
I've got the radio mode set to 802.11n only (5GHz) - 802.11b/g/n. Am I able to set it up so that the n capable clients use the 5GHz band and the b/g clients use the 2.4GHz band so that they don't slow down the n connection, or would I even want to do this?
Thanks!!!

The jre is 14,872 KB (j2re-1_4_2_03-windows-i586-p.exe).
If you silently install the JRE then then licensing doesn't appear to be an issue (no dialogs appear). See http://java.sun.com/j2se/1.4.2/docs/guide/plugin/developer_guide/silent.html. Silent installation is perfect for us since our customers are very nontechnical and would be very confused about the JRE installation dialogs.
My main question remains: what is the best way to incorporate the installation of the JRE into an existing product. I solved the above-mentioned error 1500 problem by asynchronously starting the silent JRE installation after my product is installed, i.e., after the InstallFinalize step. This results in a bad human interface: the user is prompted with the final dialog with a "finish" button. However the mouse cursor is showing an hourglass intermittenly (kind of like when you logon to Windows after a reboot), for 25-40 seconds after this dialog first appears, until the JRE is installed. I have got to figure out a way to synchronously install the JRE while the user waits.
I chose to do a private install (search for "private" in http://java.sun.com/j2se/1.4/pdf/plugin-dev-guide-1.4.2.pdf), which works, but I haven't yet figured out the best way to uninstall this JRE -- it appears that simply deleting the directory tree might be the correct way to uninstall.
I have searched a lot of newsgroups for the "generally accepted" method to incorporate some Java programs into a product (i.e., how to install the JRE). I have not found anything. My conclusion is that I must be doing something that isn't done that often, either that or I've taken a wrong turn.

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+"And on the laptop running Snow Leopard, I'm only seeing transmit rates of between 50-100. On the Leopard laptop I see up to 130. Doesn't this suggest that the computers are only using the "b/g" band and not the "n" band?"+
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