Download speed of 0.13mb (which is about 128kps) is quite slow for streaming video. If you were running at over 2mb/s there would be very little buffering. You never said how much RAM
you have installed so I'll assume 1gb or less which also would allow for more buffering because you have background programs, processes, and the streaming video competing for RAM
Some things you can do to resolve this (as I see it) are:
1. Try the streaming video by directly connecting to your outgoing internet (not the wireless) and see if you have the same issue.
2. Increase you internet speed through your ISP
3. Increase RAM
(or at least disable some programs running in the background).
It's likely your wireless connection my be the culprit and there may be some adjustment you can make to the router (but that is beyond my capabilities).
Post back and let me know what happens after you try the direct connect.