BleepingComputer.com: Laptop losing connection to WPA2 network often! 4m away from router?

Hello
I have this annoying problem only on my Laptop computer which we got from school..
Its nothing wrong on the system specifications its a dualcore with 2gb memmory and so on

But everytime im home my laptop losing connection to our router often.
My router is a Belkin G+ Mimo with WPA no radious server (WPA2+WPA) or something like that in encryption
Its the same problem with just WPA.

I could be on "www.facebook.com" like now for a couple of minutes ago, and the site only loading, but nothing happens
And then the tray icon with Internet comes with a noice and a little square "Signal strengt Excelent, You are now connected to Belkin_G_Plus_MIMO_000113"
And after this message the internet is working again

There is only 2 thin walls from the laptop and the Router which has two antenns aswell and Excelent in signal strengt all the time so this is quite annoying..
We all having F-Secure with newest signature base installed so its no virus or somethhin

Windows XP Service pack 3

Please help with this problem

And as you could see im not doing anything on the computer but still im getting this problem?

Ever tried changing the channels on the Belkin device?