They are compatible with each other indeed. No worries... Follow the guidance below to pair them. http://www.tp-link.com/en/faq-258.html

You have no router and there is a broadband connection established on your PC for internet access? http://www.tp-link.com/en/faq-767.html it got detected on my tablet/phone and I could connect to it...

You followed the guidance below to connect them, right? But in topology as below, WR843ND is working in WISP mode. In your case, are you trying to use WR843 as wireless router or access point? If you...

What's the network card on your PC? Connecting the PC to modem directly, what's the speed? Upgrade the latest firmware, 150507. http://www.tp-link.com/en/handlers/download.ashx?resourceid=13312...

Submit a ticket here to ask for the beta firmware of C5. http://ticket.tp-link.com/index.php?/Tickets/Submit

Can you try different web browsers? Or try the method below. For IE11, click the "Tools"(Alt+X), and select "compatibility view settings" then add the IP address into the compatibility list. Also,You...