Is it essential to use MMC and WMI??

I am a windows xp home user with one laptop and wireless internet access. I
use various plug and play devices such as portable music players and digital
camera printer dock. What i need to know is with this set-up is it essential
that i use MMC and/or WMI as i am having various issues with my system at
present and the set-up of the afore mentioned is causing me difficulties.

Any and all advice greatly welcomed
Lelly!