OWA Exchange 5.5 .

Hi guys need some help with Outlook Web Access. It setup on my Win2k machine w/ exchange5.5 residing on it. Copied webdata on to c:\ configured my IIS but still having problems. When I try to access it http://mydomain/exchange/ i get a HTTP 500 -Internal server error. I can’t seem to get it working. I followed the instruction from http://support.microsoft.com/default.aspx?scid=kb;EN-US;q246203 please help thank you in adcanced!