When you try to run a program compiled 15–20 years ago, that program expects to find msvcr71.dll in your system folder. Since it isn’t there, Windows 11 throws the "was not found" error.
By using the official redistributable (Method 1) or a simple manual copy (Method 4), you can resurrect that old game or business tool in under two minutes. If you value security and simplicity, avoid shady DLL websites and stick to Microsoft sources or verified all-in-one packages. msvcr71.dll was not found windows 11