Your game probaly came loaded with a "Cracked" gtasa.exe so you can play without using the CD. Try clicking the exe and see if San Andreas loads, also look to see on the "Start" menu if it says v2.00 if so you need to Downgrade using a SA Downgrader (Google for it). Once downgraded if you need to install SA:MP and try connecting to Argonath, if you still have problems post back.