A few words of thanks would be greatly appreciated.

Vista - Increase wireless internet speed

Windows Vista's 'Remote Differential Compression' is causing the slow transfer rate. How to disable this feature?
To disable 'Remote Differential Compression'

Start>>Control Panel>>Programs and Features

Click on 'Turn windows features on or off' on the left side of the screen

Unchecked 'Remote Differential Compression'

Thanks to Trev for this tip on the forum.