naxster :
i think that my internet speed is fine, because it runs smoothly on my desktop computer, without buffering =)
And how exactly do you "think" 800 kbps connection is "fine" for watching 3 mbps video? Don't you pass simple math course?
I don't know what is the situation with your desktop, or with the desktop of your neighbors, but the connection of your laptop is definitely not "fine".
I also don't know what causes it. If it's not your ISP who delivers good bandwidth to you, then it's your WiFi router or your laptop may need also drivers for it's wifi card.
Do you install such drivers /I would ask - any drivers at all; when you buy hardware do you bother to read the manuals/?
Or it may be bad hardware as cbrunnem say.