installing INFORMIX SE on Windows NT workstation

I'm trying to install INFORMIX IUS on a box running NT workstation. The box is in a domain served by a NT Server, but I'd like to avoid running IUS on the server (the workstation has more space and is less loaded). When I run the setup.exe program it complains that: "You are not an administrator of the local machine. In order to run this program, you must belong to the administrators group of the local machine." I'm trying to run this from the administrator account of the domain, and I've tried creating an Informix account and placing it in the administrators group. No diff. Is what I'm trying to do possible? Eric.