Cannot access Internet with some device only

[lololmaker]

Hello !
I am currently experiencing trubles with my WiFi network. I have used it just fine for past two years with laptop and iPod Touch 4G, but I am unable to connect my newly built PC to the Internet.

I've used Asus WiFi Go adapter at first because I thought that it's just a hardware problem with it, so I decided to buy TP-LINK TL-WN722N adapter, which has same issues, I can access everything on the local network (LAN), but I can't access the internet, however Windows reports it is connected to the internet. The router I am using is TP-LINK TL-WR340GD.

It is getting frustrating, because it must be misconfigured router but why do the other devices still work ?

I contacted TP-LINK support, but I also hope you can help me resolve this issue.
Thanks in advance !

 

[lololmaker]

Actually I just discovered I can't access router's settings when only on WiFi, but I can access gateway's settings and ping other computers.
[strike]So that MUST be router's fault.[/strike]
Another twist, tried on another computerm running Windows XP though and it works just fine, so it's my computer/OS.
Should I try installing new version of windows on separate partition ?

I'm still seeking for some information :/