Arturas_M,
Since you connected to another router with no connection issues, I would say look at the settings in your wireless router.
How to login to your wireless router I use these Recommended Wireless Router Settings I use channel 11. I would make a new SSID to make connecting easier. Some Belkin routers have trouble connecting using WPA security. It has problems determining the difference between WPA-PSK(TKIP) Security(Personal) and WPA-AES
Rick