First of all, if you don't already have a program that allows changing MTU and other communication settings download Dr TCP and run it.
A Google search for ADSL Tweaks will gather much information on the subject.
Using Dr TCP try changing settings to:
Tcp Receive Window - 261120
Window Scaling - Yes
Time Stamping - No
Selective Acks - Yes
Path to MTU Discovery - Yes
Black Hole Detection - No
Max Duplicate ACKs - 3
TTL - 64
Choose appropriate connection type
MTU - 1492 or 1500
Above settings are just starting point. You will find other suggested settings when you do the Google search for tweaks.
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