Note that servers.def is a text file - so I recommend to right click the link and select "Save as". If you left click it, it may open in your browser as text (as a page). In that case, you can simply copy&paste it to the corresponding file, but the first method is definitely more convenient.
Sorry Vlk but this is not clear for those who have never followed this procedure before. What do you mean "copy and paste it to the corresponding file"?
I looked in C:/Program Files/Alwil Software/Avast but there is no corresponding file there called servers.def, where do I look, which file do I open and once there is it a right click and open with Notepad again?
Running Windows XP Home Edition Service Pack 1.
I'm learning an awful lot from you people...