You are running 64-bit Windows. .NET 1.1 is 32-bit only. Solution: Enable 32-bit application support in IIS or use a 32-bit virtual machine. Install the x64 compatibility fix (KB928366).
If Microsoft's links are down, reputable archival sites like Internet Archive may host original installers. Installation Challenges on Modern Windows (10/11) Net Framework 1.1.4322 Download
: The number "4322" refers to the specific build version of the Common Language Runtime (CLR) 1.1. You are running 64-bit Windows
The is a software development platform released by Microsoft in early 2003. It is a key component required to run many legacy Windows applications built in the early-to-mid 2000s. Install the x64 compatibility fix (KB928366)
: Included features for code access security to isolate ASP.NET applications. Important Download & Installation Notes
Run Windows XP SP3 (or Windows 2003) in a VM using Hyper-V, VirtualBox, or VMware. Install .NET 1.1 there. Keep the VM from the network or behind a strict firewall.