To install Railo 3.1.0.012 on Vista beside a version of CF8 already running with Apache 2.2 it's not so complicated.
I will suggest to install it like that instead of using the Express version because in the Express version the SES doesn't work and you have also to tweak somes files to point it to the right directory.
You need to follow this good tutorial.
For myself I had make one modification to get everything running properly
It's in the file resin.conf
<host id="railo" root-directory="f:/">
<web-app id="/" root-directory="www"/>
</host>
