Internet Speed problem

I have been using my current ISP for 2 years right now. I use Roadrunner which I think is either broadband or cable internet. For some time it was going very fast, but my computer has gone through a major slow down on the internet. I don't know what settings I have changed or what I have done. Every computer In my house is going faster than mine. I have tried TCP Optimizer and the internet is still the same speed. I have put up with my internet problem for a while but it has become unbarably slow, and I realy want to fix this proble.

If you have any knowledge on this issue plz dont hesitate to post. BTW I am not to tech saavy and may not know all the terms used so bare with me.

 

What speeds do you get?

http://speakeasy.net/speedtest/

Have you tried restoring the XP automatic detection for TCP settings since setting them manually have result in this problem?

 

When I take the test I am getting weird numbers ranging from 4726KBps 218KBps to 8 or 9000KBps. I know none of these numbers are the speed I am going at, because it feels like I am using dial-up. BTW, what speed am I supposed to be getting? Also when the speakeasy speed test is being done it never seems to be a clean go from 0- 100 percent complete, the red dot will stop, start, speed up, or slow down. Is this normal?