If you have the CD, look for the "upgrade.htm" document in the x86-Windows folder on the CD which will bring you to the upgrade website with the username and password.
Also do not try to install the JRE 1.4.2 that comes with the CD on the Vista 64-bit. I don't think it will work. Your Vista may already have the JRE installed (verify by entering "java -version" from the Command Prompt. If not go to Java website to download and install the correct JRE version.