configure ftp account for subdomain in IIS5

Guys

I have a number of subdomains on my server and a default ftp account which points to the root of one of them.

I need to set up another ftp account which points to a different subdomain.

I've tried adding it as a new site but if I set the IP address to All Unassigned then I get the error

'The service could not be started because it is not correctly configures. Make sure that its server bindings do not conflict with other sites running on the same machine'

I get over this error but using the actual IP Address and the service starts however when I try to log in to my original ftp account it points to the new subdomain root.

Any ideas?

Cheers

Peter