Web Cam Not ditect after instaling Windows 8- HP ENVY15-3040nr

I installed windows 8 for my HP ENVY15-3040nr.
installed as a press instalation (formated my HDD)
downloaded and intalled all compatible drivers and software form HP support site.  But my web cam is not ditected.
At the device manager I can see two deices not installed
   unknown device
   USB-IF xHCI Host Controller
Please help me to solve this issue

Have you used the HP Support Assistant to search for any missing drivers or driver updates? If not, I would downloading it and running it to see if it can find anything. I would also recommend that you check and make sure all of your Windows Updates are installed. Try that and let me know if it helps find the missing drivers for you. 
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