So you're missing "ms4n_c1.rom" from the "mslug4nd" set if I'm not mistaken.
If you are lucky enough you'll also have the "mslug4" encrypted set. If that's correct, start Kawaks, go to menu "Tools" -> and check "Enable save decrypted Cs after loading". Now start "mslug4" and wait untill it decrypts and save the roms, it should took a while. Once it's done, it would generate some "ms4n_c#.rom" roms on the emu's folder, so zip them on "mslug4nd.zip" on your rompathb (roms folder)
If you don't got the "mslug4" set, please post what C1 rom you have, or better the whole "mslug4nd" or "mslug4" set. It would be good to know the rom size and crc too.
Upload an image from winzip or winrar showing the crc32 if necessary, on imageshack.us or phtobucket. Otherwise, use this little tip:
Get pkunzip.exe elsewhere, then copy it to your roms folder, then copy the next text on a "pkunzipinfo.bat" file:
pkunzip *.zip -vn > pkzipinfo.txt
Now execute the .bat file, so a "pkzipinfo.txt" text file it's generated, open it, copy the contents and post it here