I want remove as many drivers as possible to reduce the size of the ISO.

Is Bluetooth classified as modem in the drivers component?

Also, would removing drivers stop Vi$ta from downloading necessary drivers
from Micro$oft after installation?

Found an old thread: http://www.msfn.org/board/Bluetooth-Periph...vi-t115157.html

Only one question left:

Would removing drivers components disable automatic driver download from Micro$oft?

No you can still use windows update to install driver