This is a little amazing. I can buy downloading the .net -- which comes in 1.1, 2.0, and 3.0 -- all of which are supposed to be able to run on the same computer -- at the same time. ( I have 1.1 and 2.0)
Uninstallling the Java2.0 seems awfully strange -- unless the DVD requires a different version. Maybe it wants to install a different version ( which could be an earlier one), and it won't if one is installed. In my opinion that's a pretty bogus installation process.
Glad that you got it working.