To run applications on the .NET Framework, you need:

Minimum Requirements
Processor Client (a computer not working in a server capacity): 90-megahertz (MHz) Intel Pentium-class processor
Server (a computer working in a server capacity): 133-MHz Intel Pentium-class processor

Operating SystemThe .NET Framework 1.1 Redistributable is supported on the following platforms:

Microsoft Windows® Server 2003* (.NET Framework 1.1 is installed as part of the operating system)
Windows XP Professional*
Windows XP Home Edition
Windows 2000*
Windows Millennium Edition (Windows Me)
Windows 98
Microsoft Windows NT® 4.0 Service Pack 6a
Notes: ASP.NET Web applications and XML Web services can only be hosted on Windows XP Professional, Windows 2000, and Windows Server
2003

The .NET Framework 1.1 Redistributable cannot be installed on 64-bit computers; Windows NT 4.0 Terminal Server is not supported
MemoryClient: 32 megabytes (MB) of RAM, 96 MB recommended
Server: 128 MB of RAM, 256 MB recommended

Hard Disk110 MB of hard disk space required, 40 MB additional hard disk space required for installation (150 MB total)
Display800 x 600 or higher-resolution display with 256 colors
Input DeviceMicrosoft mouse or compatible pointing device
OtherMicrosoft Internet Explorer 5.01 or later is required (click to get Internet Explorer 6.0).
Microsoft Data Access Components 2.6 is required for data scenarios (Microsoft Data Access Components 2.7 is recommended on a
server).
Install the latest Windows service packs and critical updates from the Windows Update site.