dsl connection is half what it's suppose to be

My home computer is cutting inhalf the speed I'm suppose to get. MY readings are 1331.6kbps. I'm paying for 1500 to 3000.kbps. I know this because i can hook up my lap top and get 2600.kbps. Help I can't figure out what my home computer is doing with the other half. I do not have it hooked up to the linksys. Could it be my ethernet card. I'm new, I would appreciate any help. Thanks

 

Well I didn't get much help, so I fixed it myself. The problem was a bad ethernet card or an old one, but I went out a got a new one and it works great. Thanks I hope maybe this will help someone else. I know the tech people with my dsl service could'nt figure out either. Take care