In older versions of Windows , programs which linked against MSVCRT. DLL were expected to install a compatible copy in the System32 folder , but this contributed to DLL Hell .
Many installers failed to check the library version against the installed version before replacing Windows .
In older versions of Windows , programs which linked against MSVCRT. DLL were expected to install a compatible copy in the System32 folder , but this contributed to DLL Hell because many installers failed to check the library version against the installed version before replacing it .