I can't install the patch? Any idea, help please?!

I get this window after I start install it!

"RomeTW.exe Unable to locate Component.

This application has failed to start because MSS32.DDL was not found. Re-installing the application may fix this problem."

What dose it mean "re-installing the application", I tried to reinstall the patch with the same result, do I need to reinstall the game it self?

Thank you!