that is because you dont know that it takes a group of HP drivers to make that work, NO JUST ONE.
why post lacking what OS is there, most have 11 choices then.
windows 7 64bit or what? the bits matter too.
my HP Elitebook must have a working USB2 chip(and ports)
if not the camera is dead, due it using USB2 to comm.
and the camera has 2 makers, and must match.
here is the magic tool from hp, smart agent
http://h18021.www1.hp.com/helpandsupport/hp-self-support.html
the full PC support is here, ever heard of HP.
lets go to HP real now, the REAL DEAL.
this PC had 6 OS choices new. XP, Vista, w7 32/64bit
so if you look and pic the right OS, there
you get the right drivers. (hint, leave BIOS alone)
https://support.hp.com/us-en/drivers/selfservice/hp-probook-6450b-notebook-pc/4173642
or boot and hammer F11 and go back to day one.
your PC was probably slammed,'
someone use Non HP disks to restore the OS. and now F11 dead forever and the special HP drivers are missing or WRONG.
http://www.pcdied.com/slammed.html
slammed means the PC is not 100% authentic,anymore.
#1 way to do that is installing a new HDD , wrong.
#2 using Microsoft disks, (not HP)
1000s asked this here, and answered
and 10,000 at HP, you are not the first nor the last.