my internet is suddenly slow

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http://askubuntu.com – im running Ubuntu 12.10 and it works like a charm... but one problem, when i updated my software everything seemed OK until i noticed that my internet speed very slow. i had about 5-6 MBPS but it suddenly changed to 130 kbps max speed no higher, so to see if it was my internet i booted up windows to see my speed on there and it went right back to 5-6 MBPS. rebooted to Ubuntu and back to 130 Kbps ??? can anyone help me with this. it took 2 days to download team fortress, when it usually takes only about 54-6 hours... please help. (HowTos)