I'm just wondering if anyone has created a modpack to change back to vanilla Civ 3, or "remove" a previous modpack. This would be very helpful, as running on a laptop I don't have much space, and this would be a lot easier than keeping 2 copies of the game on my computer.

This is the wrong forum for questions, you should pm a mod to move it :)

to answer your question, just reinstall civ3 :)

Get Conquests or PTW. They allow multiple modpacks that can be loaded from the game's main menu.