http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=a8f5654f-088e-40b2-bbdb-a83353618b38
Overview
The primary focus of Microsoft .NET Framework 1.1 Service Pack 1 (SP1) is improved security. In addition, the service pack includes roll-ups of all reported customer issues found after the release of the Microsoft .NET Framework 1.1. Of particular note, SP1 provides better support for consuming WSDL documents, Data Execution prevention and protection from security issues such as buffer overruns.
SP1 also provides support for Windows XP Service Pack 2 to provide a safer, more reliable experience for customers using Windows XP.
SP1 is available in 22 languages.
System Requirements
-
Supported Operating Systems: TabletPC, Windows 2000, Windows 2000 Advanced Server, Windows 2000 Professional Edition , Windows 2000 Server, Windows 2000 Service Pack 2, Windows 2000 Service Pack 3, Windows 2000 Service Pack 4, Windows 98, Windows 98 Second Edition, Windows ME, Windows NT, Windows XP, Windows XP Home Edition , Windows XP Media Center Edition, Windows XP Professional Edition , Windows XP Service Pack 1, Windows XP Service Pack 2
Software Requirements:
List of bugs that are fixed in the .Net Framework 1.1 SP1