why is my internet so slow all of a sudden?

Depends- when is it exactly slow? is it while surfing the internet, or when running progrmas? either way, you can make it go faster. If your internet is slow, you should scan your computer for viruses and spyware using suitable programs(for example- avast anti virus or spybot). If you still experience the same problem I would advise you to delete the computer after backing it up, and then installing a new copy of Windows. if your problem is with programs running slowly- I can advise you to download this software, which can extremely help- CCleaner.Good Registry Cleaner will improve your computer and Internet performance dramatically! Do all these and Perform speed here scanmyspeed.com once it will sounds better ...