Mongrel lost port

Hi all,

Installed mongrel after I finished my application so I could run it as a
windows service… Installed fine and when I pointed at
http://localhost:3000/system the homepage came up fine. But when I
clicked the links the port number(3000) disappears, for example
(http://localhost/lab/system/show/2) and i get a 404 not found error.
Any idea whats up? My Application works fine when I run it with