Scanning across a domain

I would assistance on how to scan from one domain to another. Both domains are inside our firewall, but the Workstation scan seems unable to deliver all the appropriate information, such as PC name. It gives the IP number instead of. This is nice to have, but not enough.

For a lot if the PCs it returns with an error message of:
Either access denied for the user or the remote DCOM option might be disabled in the workstation.

However, I know the user ID and password is correct, and that the DCOM is enabled.

I expect it only requires a checkmark, but I haven�t found out where to put it yet.

Can anybody help?