Region : Others

Model : TL-WR841ND

Hardware Version : V5

Firmware Version :

ISP :

Hello,
We have a problem regarding the connection of our devices to the internet.
We were using the wireless connection from the router for 2 mobile phones, 3 tablets, 1 Smart tv, 1 desktop(win7) and 1 laptop(win xp).
The desktop has the tp-link pcl adapter 300Mbps installed.
After instaling the win8 to the desktop we lost all of our drivers and we reinstalled the win7.
From that day on, the desktop couldn't connect to the internet although the router signal was powerfull.
I've tried to manually change the IP address with no success.
Additionally to that after connecting an extra mobile phone to the network we lost connectivity with the laptop as well.
I don't know if there is a connection to all of these that I am saying but I don't know much about these things and I could use your help!
Now the only devices that have connection are the mobile phones,the tablets and the tv which is wired connected.
Thank you in advance.