possible y have 2 different mss32.dll files on your harddisk.
1. go to install directory from men of war (check properties from mss32.dll) must be the same (version, date, size) as picture.
2. search your harddisk for other mss32.dll files and check version, date, size. delete this files or replace this files with mss32.dll from MoW folder.
other programs (eg. WinAmp) install an "old" version from mss32.dll to your harddisk - possible game will use this file and get an error.