how much hard drive space do you have? [link|http://www.cygwin.com|Cygwin] can take up to 500 Megabytes with all the options installed. It does have a built in [link|http://www.postgresql.com/|Postgres], but I have not tried it yet. It also has a built in Apache, and other Unix programs.

For some reason Postgres needs Cygwin to work. But in the process you get a Unix environment for your Win98SE workstation. :)