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Go to http://downloadcenter.netgear.com/ and enter you full model number where it asks... then select the software you want from the results returned. Beware that the WNA3100 and the WNA3100M DO NOT take the same software!
It looks like your NetGear WNA3100 is dead out of the box. The software looks like it operating correctly (runs the installed diag, tries to detect, etc.), but the software isn't having any luck finding the hardware. The reason that the adapter is disabled in Device Management, is that the software seems to have correctly installed the driver, but Windows couldn't detect (plug & play) the device, so Windows didn't enable the device driver - Windows won't load a driver for a non-existent device. Other (remote) possibilities: (a) Wi-Fi adapter plugged into a bad USB port. - try another port. (b) there's a little corrosion on USB contacts of USB port or WNA3100. Try plugging adapter in and out of the port a few times (this shines up the contacts a bit). (c) there's a slight misalignment of contacts within the USB connector or either the laptop, or the WNA3100. Your fix may be returning the NetGear WNA3100 to the retailer for an exchange.
in my case i dont use belkin wireless usb.ive rather use same brand with my router.i got dlink router too just like yours..and i have edimax wireless 802.11b/g/n nano usb adapter..well up to now no problem getting slow DL and UL. try it..
First thing I'd do is call the store that you returned the laptop to and tell them it was still in there. Most stores are pretty good for catching these things.
As far as purchasing a new adapter you have dozens of options. Try to match the speed ie a G or N type card. Thats about the only thing to look at. You can also consider a extension cable that lets you put the adapter away from the laptop a bit. Thats handy but not needed. And you also have the option of getting a PCMCIA type network adapter. These fit into the credit card type slots on the side of the laptop not the USB. These are a bit faster and take less to operate so they don;t use up as much cpu or memory to work (better choice if it is older slower laptop) the only problem is they cost a bit more. Stick with a name brand and try to find a good warranty. Some of the off brand cards are 30 days and that seems to be how long they last. A good one will last years.
i have seen issues with wireless USB adapters. Can you try another USB port on the computer? Also delete the adapter and let it br reinstalled. If this does not help, I would suggest returning it and getting a Linksys adapeter.