Windows 7 USB Drivers

Today I installed Windows 7 Professional 64-bit on my HP Pavilion M6 laptop that I'm giving to my father. I've gotten all of the drivers working, except for the USB drivers. Currently, only one of the four USB ports works, which also happens to the port that was used when I installed Windows 7 from USB flash drive. I've looked on HP's website for the USB drivers and come up with nothing. I tried having Windows automatically update the drivers, but it fails saying that it cannot find them. Any ideas what I can do?

Specs:
Windows 7 Professional 64-bit
AMD A10-4600M APU with Radeon HD Graphics
6.00 GB of RAM
15.6" 1366 x 768p screen

What is the exact model? Should be on the bottom of the laptop, probably on some label that says:

MODEL: M6-XXXX

Try finding out the motherboard for the laptop and looking up the drivers via the manufacturers website for the mobo.