I mentioned this on the ESS list a little while ago, I made an installer for ESS and XEmacs on Windows. It worked for me but given my minimal knowledege of ESS and XEmacs, it might not be the right way to do it and may or may not work for you. I hosted it and the source for the inno setup script at http://brewiki.org/XEmacsESS but would be only too pleased for it to move somewhere more appropriate and modifed as deemed necessary. cheers