A quick Google session brought up this:
"Rainbow Bridge," by the way, refers to the "bridge" spanning the gap between the two color realms, not to the bridge between Asgard and Midgard that Heimdall watches vigilantly.
"Rainbow Bridge is a component of PageMaker 6.0x that enables PageMaker 6.0x to access Color Management Software, and is one of the first components PageMaker loads during startup. Ensuring there is enough memory available to start PageMaker and that PageMaker, one or more of PageMaker's components, the system, or the hard disk are not damaged, enables PageMaker to load Rainbow Bridge as expected."
PageMaker CMS preferences Program Files\Adobe\PageMaker 7.0\Rainbow.cnf
So, at a guess, uninstall the CMS system using the setup CD and delete the configuration file "Rainbow.cnf".
No guarantees mind as you are using a last century application on a current OS.
Your choices for effective working are:
Iechyd da! John
12:47 30/11/2009 GMT