If you want to run MOM 2005 user interfaces in Vista you will have to first install .NET Framework 1.1. If you then want to run Vista interfaces with another domain account you can create a new shortcut and use the runas.exe command. For example

runas.exe /user:DOMAIN\LOGONĀ “C:\Program Files\Microsoft Operations Manager 2005\mom.ui.opsconsoleexe.exe”

.NET Framework 1.1