Disabling Tekkit Mods

[Shiny]

I'd like to run a Tekkit server with just a few of the mods, but when I remove any one mod from the mod folder, the server throws out errors and won't start. I've tried removing all of the zip files that I didn't want, and I've tried removing just one at a time with the same results. I'm hoping you guys could explain what I'm doing wrong!

For reference, I'd like to use the following mods:

Forge

RedPower

Nether Ores

NEI

MAtmos

Rei's Minimap

Inventory Tweaks