Nobody's tried more things than I have.
Let me see if I can help. Firstly, go to
www.pcpitstop.com and speakeasy.net and test your download speeds. Report them back here.
Also, for those that are having problems, are you on a wired or wireless connection and if you are on wireless, are your problems any better on your wired connection? If there is improvement on the wired connection, get your internet speeds for wired as well and report back.