I have lost my conquests CD, can I still play GOTM using Civ Vanilla?

I'm afraid not, it was quite some time ago the powers that be decided not to accept Vanilla entries, only PtW (for GOTM) and C3C (for COTM) are accepted nowadays.

Thanks. Never mind. I think I left the CD in my old PC which I sold. Ngah.

Civ3 Complete, or whatever it's called in your neck of the woods, is available at silly low prices these days. Contains all the expansions.