One prog I found best for removing Ad and spyware related items is
Ad-Aware. Simple, Free and I use it on all the pc's at work
And for the opening up a little more bandwidth, And I have seen this work by doing numerous tests is from
SpeedGuide.net
Registry tweaks, that I know have helped a little bit, But the tweaks their are for 98/NT/XP. Granted their is nothing out their that can double ur speed or etc. Just not possible , Sometimes we can be Limited by our isp too, But their is some proven tweaks.