Due to US government regulations, only US and Canadian customers can download 
the 128-bit version of Windows NT Server 4.0, Terminal Server Edition Service 
Pack 4. When you click the link below, you will first be asked to click through 
two pages that detect whether your Internet address is located in the US or 
Canada before actually beginning the download process:

   http://support.microsoft.com/Support/NTServer/Content/ServicePacks/Default.asp