Microsoft uses 20% share of the bandwidth allocated by the DSL for its Updates process, even if the Automatic Update option is turned off . So try to get rid of that. Use firefox and turn automatic updates off for any of the applications you use. that would help.
If you are at the Darker side of the internet ( The shouldn't named persons hackersss....pssss...yeah !!! sry ), there are lot more ways but if you are at the good side ,
just get the greater speed plans from your dsl...;-)
To increase your internet speed contact the internet service provider,
After that test your internet speed through this site IP Details.com , It has the best & accurate results for my internet speed test , internet service provider,location, country and and also provides the IP details .................