It sounds like MSVBVM50.dll is missing . I don't know what the cause of that would be, however - if you installed UE properly into the Secret Ops folder, everything yo need to run the game should be there... I think.
The missing DLL must be used by the launcher, not the game itself. The launcher is coded in Visual Basic, wich requires a few Microsoft DLLs to be installed on the PC to run (wich I why I personnaly never code with Visual Basic). Most people will already have suitable DLLs installed to have VB EXEs running since many software will install them along with their own code.