Connection issues, please help

So here’s my problem.

Saturday night, WoW (World of Warcraft) crashed and from that moment I wasn’t able to connect to the game anymore, it kept saying ‘’Unable to connect’’;;. However, I was able to play on my other computer just fine. I reinstalled the game twice since then but it didn’t change anything. However, I am now stuck on the realm (server) list page. I have tried everything, powercycled my modem and router, deleted , cache and Interface folders, opened my firewalls ports.

At first, I thought I might have a third-party program on my computer not letting me log on, but I plugged this computer to my router and it worked perfectly fine (does plugging it directly to the router mean that it’s not blocking any ports?). At some point, I thought it might have to do with my wireless card (I was getting some frequent disconnects and still getting some so I thought it could be the problem) but it doesn’t seem like it, I’ve successfully logged on some other games such as Crysis (multiplayer mode) and I also updated the drivers.

What could be the problem? Any help is greatly appreciated.

Laptop: HP DV5T, Intel WiFi 5100 AGN