BDE 4.51 - Problems connecting to Oracle 7.3 DB

I'm experiencing problems trying to connect Delphi to our Oracle database,
it works fine for other things like SQL+, ODBC, etc. but the Native Oracle
driver does not seem to want to work at all.

I'm getting a 'Vendor Initialisation Failed' when using 'connect' from the
'alias manager' in the 'database desktop'.

All of the information specified seems to be correct, but I just can't get
it working! Help!

(Please send any response direct to me)

Thanks in advance...