ENT Era ships problem

[|PX| Iceman]

I have installed a few of the ENT era ships, such as the Xindi aquatic and insectoid ships, the neptune class, as well as the klingon pack, and all these work just fine.

However, 2 of the ships I installed DO NOT show up on my selection menu. they are:

Enterprise
Romulan Warbird

I have tried several times, even manually installing each file into its corresponding folder as opposed to using the BCMI, but the results are the same each time.

Any ideas? Any help would be appreciated!