There are quite a few situations recently which have come up where you might want to bypass the MOM 2005 installation prerequisite checker. These include installing MOM 2005 (not SP1) on a Yukon server, installing the MOM UI on Windows Vista, or installing MOM 2005 in a situation where the prerequisite checker does not acurately detect the software installed or hardware.
If it detects a failure to meet a minimum software or hardware requirement, the MOM 2005 prerequisite checker is designed to prevent the user from installing the product and getting into a bad state until the minimum required software or hardware is installed.
In these situations, you can bypass the prerequisite checker by installing from the command line and passing a parameter which tells the MOM setup to skip the prerequisite check. To do use msiexec.exe and pass PREREQ_COMPLETED="1".
See the MOM 2005 Deployment Guide for more details on the required and optional command line parameters.
See MSDN for more information on the msiexec.exe command line parameters.
There are quite a few situations recently which have come up where you might want to bypass the MOM 2005...
I really can not get PREREQ_COMPLETED="1" or =1 work with MOM 2005 WE with SQL2000 SP4. Are the switches really the same with EE and WE as KB902803 says, tried that several times...
Changing version on registry helped, but still... : )