Regsvr32 ] steam_api.dll /n - do not call DllRegisterServer this option must be used with /i RegSvr32.exe has the following command-line options: You might have to restart the computer if you are still getting DLL errors It will only take a few seconds to install and you will get a message when it is finished.In the black window write: regsvr32 steam_api.dll and then press Enter.
Dll usually should be in the folder C:\WINDOWS\system32, C:\Windows\SysWOW64\ or in the application folder in which the error occurs. If you have an error related to steam_api.dll, check there is a file on the computer.