Hello Everyone, brand new to DotNetNuke and DNNCreative and I am really enjoying it so far

Have a questions concerning my localhost installation. I currently have IIS 7 on Vista and I'm running my localhost under port 8000 and when I access my dotnetnuke installation I go to:
localhost:8000/dotNetNuke
and it works just fine.
However if I go into Portal Aliases under Admin>Site Settings my HTTP Alias is:
localhost/dotnetnuke
which is wrong.
I tried adding the address with the new port number to portalAlias, but I keep getting
The Portal Alias is invalid.
This causes a bit of an issue when I access the portals under Host because when I click the link for portalId 0 it goes to a "Not Found" page.
Is there another way to change the Portal Alias? Or am I missing something?
Thanks!
Rob