When installing SQL Server 2005 with Polyserve, the install fails with error 28001. 

This is because when Polyserve first began supporting SQL Server 2005, the software had an issue / bug with the Password validation.  SQL Authentication password validation did not work under Polyserve.  The bug has since been fixed.  But our installation uses the template.ini, which contains an sa password that does not meet the validation.  So now that the bug is fixed, and password validation is working; the install fails.  Solution is very simple, to edit the template.ini file to contain a password that meets the validation requirements.

To dig down into the 28001 error you have to to the individual server(s) where the install failed and find the install log file, c:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\LOG\Summary.txt