Microsoft .NET Framework version 1.1 is not supported on any version of Windows 7 or Windows Server 2008 R2. While it may be possible to install .NET Framework 1.1 components on these operating systems, Microsoft will provide no level of support for these configurations.
The Microsoft .NET Framework 1.1 is supported on operating systems up to and including Windows Vista. More information on supported versions is available at the following web site:
Windows 7 Enterprise, Windows 7 Home Basic, Windows 7 Home Premium, Windows 7 Professional, Windows 7 Starter, Windows 7 Ultimate, Windows Server 2008 R2 Datacenter, Windows Server 2008 R2 Enterprise, Windows Server 2008 R2 Foundation, Windows Server 2008 R2 Standard