Hey! I have AMD Athlon 3.2,1gb ram.I don't use any routers.I have cable internet from adelphia.I can't understand what is wrong with my computer,because everything else runs great.Here is the problem

starts,everything looks cool for about one minute and suddenly speed drops very quick to 0kb and never starts again.I had the same problem with emule and kazaa...Can anyone,PLEASE,help me with this problem?I don't know a lot about computers,just love playing games and listening to the music but now i can;t download any of them.I would be glad,if someone can help.