Microsoft .NET Framework 1.1 & Service Pack 1
Click here to download Microsoft .NET Framework version 1.1

 filename: dotnetfx.exe, file size: 23698 KB
Click here to download service pack 1

 filename: NDP1.1sp1-KB867460-X86.exe, file size: 10453 KB

 This file is the upgrade to Microsoft .NET Framework version 1.1

 You will be able to start installing GoMail after you have installed Microsoft .NET Framework version 1.1  & its Service Pack 1.