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My dad's laptop seems to have inexplicably lost it's wifi capability. It's like the Wifi network adapter doesn't even exist anymore. At first I just assumed that maybe the circuit fried or maybe just disconnected from the motherboard. But the thing that's really throwing me is that when I do a full check of device manager (i.e. "set devmgr_show_nonpresent_devices=1 start devmgmt.msc" in the command prompt), there is no record of the computer EVER having had a Wifi network adapter. I've had circuits fizzle in my computers before, but even when that happens, the computer still remembers that it used to have a working circuit inside it. In this case, the Wifi circuit seems to not only have died, but to have been completely erased from the computer's history. My dad reckons all this began with a recent update of his Norton's 360 security suite which required a reboot. I'm inclined to believe that may be the culprit - it wouldn't be the first time Nortons has caused us grief. However, I've done a full uninstall of Nortons and the problem still remains. I've tried reinstalling the network adapter drivers as supplied by HP, and I've also tried sfc /scannow, which turned up nothing. If this is a hardware fault, it's a bloody odd one, to have erased all trace of the working part from Windows' memory. Can anyone offer any insights as to what might be happening, what I might try next? The OS is Win 7 64-bit.