For those of us with some comp problem, Internet speeds in particular, here is a site that has some good diagnostic tools and help links.
//www.pcpitstop.com
I did the download test and was around 443kb/s, after clicking the tweaks recommended I went to 2400-2800kb/s.
Hope this helps you. Also has a downloadable tracer that can help find out who or what is trying to access your comp :D