Slow Internet can be caused by many thing, I need more info to make a informed suggestion, But you can start be running a FULL virus scan with a good anti virus, also you want to run a FULL scan with a malware program, I would suggest using MALWAREBYTES found here:http://www.filehippo.com/download_malwarebytes_anti_malware/
. If you do not have a UP TO DATE Anti-Virus, one can be found on the filehippo site for free, REMEMBER to uninstall the anti virus on your machine, if you want to try another anti virus, always use the Makers REMOVAL TOOL if they supply one, I use AVAST, but that is your choice. If you have a Anti Virus make sure it's updated and working properly. You statement,"Internet in my computer is very slow" does not give me much to work with. Need computer Manufactuer, Model, type OS, etc. Also are you using TOOLBARS on you IE or what ever Broswer you are using. TOOLBARS, MESSENGERS, CHAT, any thing that is "hogging" your resourses when using your broswer SHOULD BE DISABLED, the rule is the more "Stuff" you have running, on you computer at start, or your broswer will slow it down. It's like YOU, on a long walk, ever half mile you pick up a 10 pound weight, after a day treck you have to slow down a bit. To make a short story long, GET RID OF THE EXCESS BAGGAGE. If you need assistance respond to this solution.