webservice in 2005

[perspolis]

Hi all
I had a webservice written in 2003 but now I immigrate to 2005 and face to
some problems.
when I run it from IIS I get this error
"A name was started with an invalid character. Error processing resource
'http://localhost/test/CmpnyMngrWebSrvc/CompanyMana..."

but when I run it from 2005 it open it and gives it a port number and works
correctly..I'm wondering ??
how can I change port number and how can I run it without port number and
from IIS?/

thanks