Let Windows install the adapter.
If you didn't try this already, uninstall the adapter software you installed. Restart and plug the usb adapter in and let Windows find and install whatever drivers, etc. came with the operating system. Check your router settings to make sure you're not blocked by any filters like MAC address filtering. You can find IP address, MAC, etc. numbers in Windows by typing "network connections" in the search box, right click on the connection then "properties" then "details". Do this while you have it wired so you're sure you have a connection. Also, try disabling any filters to allow any device access, disable your security, and enable SSID broadcast and see if you can connect. Don't leave your wireless in this condition longer than necessary! If one of them is the issue you know what to work on.
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