Delete the MSVCR100.dll you already have.
Get the Redistributable Package of Visual C++:
Download Details - Microsoft Download Center - Microsoft Visual C++ 2010 Redistributable Package (x86)
If you're 64 bit:
Download Details - Microsoft Download Center - Microsoft Visual C++ 2010 Redistributable Package (x64)
Redownload msvcr100.dll and put it in your combat arms directory and your system32 folder in c:WINDOWS/.
If you're 64 bit put it in your system32 and SysWoW64
Elite encrypt it bout 5 times and should work.