Ntense

I put all the files inside of my mw2 main folder that I was told to download. When I try and open "iw4m" it comes up with a window saying: "The Program can't start because mss32.dll is missing from your computer. Try reinstalling the program to fix this problem." I removed all those files and downloaded them back again twice, and nothing works. It just keeps coming up with the same window. Any suggestions on what to do to make my 4D1 work? I really wanna play it.