One question, did you install your Mb drivers?
Ethernet controler, Multimedia Video Controlor (which make me think its a onboard video) SM Bus Controler are drivers that you will find in your MB drivers
You need to find the ref. of your motherboard.Its easier like that.The unknow device might even be your firewire port, it could be the infrared receiver for your keyboard and mouse.
http://h10025.www1.hp.com/ewfrf/wc/prod ... g=en&cc=usYou can find all for your pc in here, including drivers
P5LP-LE (Lithium) its your motherboard.
In that link you can find everything to solve your problem.
INSTAL your MB drivers all will be gone.

Keep us posted