Hi. Install this:
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And if still needed, change the wireless channel that the router's radio is broadcasting on.
Yep, sorry about that.
32 bit - Drivers for Atheros AR5009 and Windows 7
64 bit - Drivers for Atheros AR5009 and Windows 7
Cool, then use the uninstall tools in safe mode to totally remove all the leftover remnants that commonly cause issues, for each of the uninstalled 3:
http://windows7forums.com/blue-screen-death-bsod/50402-removal-tools-antivirus-software-drivers.html