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After formating and reinstalling my desktop with Win XP Home Edition I installed the newest software for my wifi USB adapter TP-Link TL-WN721N. Everything went fine and the signal was strong. I connected to the internet to download all the necessary things and about 15 seconds of browsing later my connection stopped working. The signal was still strong, I was still connected to the network but there were no packets sent either up or down and no webpages were loading anymore. This problem persisted after reconnecting to the network, restarting the computer and even reinstalling the windows anew. Other computers that are connected to this wifi network have no problems.

I tried several solutions I found on Google but to no avail. Ping command fails to contact any server, ipconfig/release works but ipconfig/renew is unable to contact DHCP server. ipconfig/flushdns works but is of no help.

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I would recommend taking your USB wifi adapter and plugging it into another machine and see if the problem persists. If you have the same issues with it on another machine, you might be looking at a bad wifi adapter – Callen L Sep 27 '13 at 18:41
I would roll back the driver for the device. Although if you reinstalled Windows and it still does not work I am going to guess the device is not working. – Ramhound Sep 27 '13 at 18:42
I don't know why I didn't think about trying it on another machine... I plugged it into my laptop (running Win 8) and it works flawlessly there. But the system calls it Atheros AR9271 for some reason... – Michal Sep 27 '13 at 23:09

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