Périphérique inconnu USB 0000002b

Hello, I am facing a big problem: Apart from my mouse and keyboard, no USB port works anymore, neither with my printer, my external hard drive, my webcam, nor even a simple USB stick, my computer is completely unresponsive. I have tried everything within my (limited) knowledge, I even reinstalled the factory settings with my recovery CDs. I looked in the BIOS but couldn't find the Peripheral configuration or Integrated Peripheral to see if my USBs were enabled: I found nothing! Nothing works. My computer is an HP P6244fr.
<config>Windows 7 / Internet Explorer 9.0</config>
Could someone help me? A big thank you in advance. Have a nice Sunday everyone. Best regards. Mamywata