Download Speeds is not good

I am using Windows XP SP2 on a Pentium 3 processor. I have LW4.8.1 pro. I have a 512Kbs connection.

When I started using LimeWire months back I used to get speeds for up to 40Kb/s. Now I can only get a maximum speed of 2kb/s but even if on web I can reach high speeds.

I have uninstalled LimeWire and reinstalled still no improvements. Deleting the preferences also does not improve teh speed. I have reinstalled Jave with no success.

Lastly I have formatted my HD and reinstalled everything, still no improvements in the download speed. I have disabled frewall, anti-virus and IDS with no success.

Has anyone experienced this problem and what have you done to solve?

Thanks