>If I can use sql*net/dev 2000 does that mean my tnsnames.ora is correct?

Yes. Have you set up a connection in your DBC using this DSN?

>Will it work if I modify it?

Yes. Just don't mismatch all the parentheticals.

>also id d:\orant\network\admin the correct one?

Yes, if that is where you indicated the products were to be installed during installation.