You may set a Static IP for your win8.1.Check your IP address.

Exactly the same problem. The router works fine with win7 and win8 laptops, but does not work with win 8.1 one (other routers work perfectly fine, so it is not a laptop's fault). I've asked TP-link for previously, but their help was in the means of "have you tried turning it off and on again?", so completely useless.

Have anyone got any ideas or already fixed this problem?

I have exactly the same problem, with the same router, ans also same version (TL-WR841N version 8).
It worked perfectly on my notebook when I had Winodows 8, and since I upgraded to Windows 8.1, Wi-Fi is not working. But in my case, the router is perfectly working with a wire connection.
And Wi-Fi still works with other computers (my smartphone for example).

Mosab94 and Futureal, did you solve the problem?

Wifi
Firmware Version:
3.13.27 Build 121101 Rel.38183n
Hardware Version:
WR841N v8 00000000
do not working win 8.1
I hope tp-link company fix this

I am also having problems with my TL-WR841N and Windows 8.1. It is working fine with other devices (laptops, phones), and the 8.1 PC is working fine with other WLAN.

Please provide some solution to this ASAP, it is very annoying! :mad::mad:

basically the connection can be created, but many things are slow, seems like the router is dropping packets. Then the traffic will just stall at some point quite soon, and sometimes the router stays functional with other devices (8.1 laptop doesnt connect anymore), but most of times the router actually does not work for other devices neither. Reboot helps, but same thing happens again... Frustrating!