Manually run 'smbclient' and see if the authorization works. Vista, and I assume Windows 7 use a different password algorithm. You might find it easier to use an lpr/lpd printer connection instead of smb.
Yes, msbclient and smbstatus on the server both "see" the Windows 7 PC - and I can successfully map a drive on the PC to the SCO server. I just can not get samba to communicate a print job to the PC /SHARE. Thanks for your suggestion.