by internet speed, what exactly do you mean? Do you mean download speeds or internet speed over all? If you mean download speeds you could get download accelerators; also dont have multiple files downloading at the same time. To improve overall speed, dont have nothing downloading in the background. Dont try to download huge files and surf the internet at the same time (unless you gots cable internet)
derger what type of internet connection do you have? dialup,dsl,cable,satalite? what are your system specs? are you wanting to download files faster? or just surf faster?