If the linksys is shown as working in device manager then
Go to Network and sharing center
Go to Change adapter settings.
You should see probably three adapters. Your new Linksys, your current Wifi adapter and an ethernet adapter.
Right click the Linksys it will probably show Not connected. You probably should click in the old adapter and disconnect now but you don't have to.
Right click the Linksys and click connect. You will get taken off to Settings, go to Networking, go to Wifi and you should be able to connect to a network. Now you have two connections so I'd recommend that you disconnect the old adapter and just use the new one for a bit. I assume that is on 2.4Ghz. If you already have your router set up to offer a 5Ghz connection then try that.