Slow internet on Knoppix 5

I've new Knoppix 5. I'm knoppix user. And this the first time that I have a problem. I installed new Knoppix 5 on HD; but the Internet conection is too slow. The XMMS radio transmision only get 20 seconds, and stop trasmission, I try with other packages, but is the same.

In Hotmail account and Gmail, only I loggin, but is not possible send, read or logout, because never get the new page, is really slow. I don't know what can be do.

I try with Knoppix 3.9 CD and Knoppix 4.02 DVD on LIVE versions, everything work fine.

¿Somebody have a similar problem? or ¿know the causes of this little hell?

Tnaks to all Knoppix experts :)