I have Endnote x3 in a Win 2003/XP Domain environment. I got the “installation ended prematurely” fatal error. I finally got end note installed by using the original local admin account that was used to install the installation of Windows. No Domain admin accounts worked and no other local admin accounts worked. I had a version of end note that created a log when it failed to install and in the log, it stated there there were no admin privileges when clearly I was logged in as an admin account that I use to install other software. This would also explain wht the problem is in all versions of Endnote