Hi:
Your problem doesn't state what driver or device isn't working on your HP compaq 6720s, but all drivers for your laptop can be downloaded from www.hp.com for free. click on the support tab, type in your model number and you can download all of them.!
SOURCE: the drivers for this device are not installed(Code
Remove all external peripherals and then restart the PC in BIOS and do a BIOS Default... Should work....
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