Shut everything down, including the Cable Modem. Leave the modem off for a couple of minutes.
Connect an ethernet cable between the modem and the router's "WAN" port and between the PC and one of the router's "LAN" ports. Power on the modem and wait for it to be fully booted and online. Then power on the router, wait for it to boot fully and finally boot the PC. You should now be able to access the router's setup pages by entering its IP address into a web browser.
The default setting will probably have let you get online with the PC that is connected with the cable. You need to configure its "wireless" settings so that the laptop can get online wirelessly then you can remove the cable to the PC.
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You only need to install the software for the Wireless Network Adapter. There is no software to install for the router to which you connect over the LAN, with either a wired or a wireless connection.