OWA 2003 broken on 2000 server

I have an exchange 2003 server running on Windows 2000 server. Unable to login to OWA. When I try to login, the WWW service crashes along with SMTP, IMAP4 POP3 and SMTP services. Also sometimes get a DAVEX error in eventlog. I think the reason things are not working is related to running IIS lockdown tool but not sure what to look for to change settings, Any ideas/help would be appreciated.