Shoutbox

Try and eliminate possible problems.

For example, try booting your computer in "Safe Mode With Networking", then use IE with deafult settings (Just to eliminate possible problems with extensions and etc, that would be on FF or Opera). If it still continues to do that, then try hooking up another device to the router. If it has slowdowns to then there is something wrong with the router/internet connection. If it doesnt, then there is a problem (most likely) with your network hardware on your computer (Your ethernet port most likely).