[TurboFool]

Manually set your speed at the bottom of the page instead of letting it figure it out automatically. It'll usually over-estimate your speed, or estimate the best your connection can do, and then stream at that speed which your connection can't hold up to.

EDIT: Sorry, looks like I missed your comment about that. Definitely try TCPMP, instead, and make sure you associate it to ASX files. There are also some adjustments you can find if you search the forums to adjust the buffer rates and such which should help.