If you really want to do things properly and be done with it ...

-de-install (dont use the "uninstall icon" but go to your settings and remove it by selecting it from the list of installed programmes than click the remove button)
-de-frag your system
-run a decent registry tool (also defrag the registry if you've never done so before)
-install Rome (DO NOT RUN THE GAME YET!!**)
-patch it to v1.5 (or BI 1.6)
-copy the entire game-folder to somewere else
-put the entire copied folder on some spare disk

**the game creates some folders and stuff if you run a pre-patched game, dont know if the stuff can do any harm or whatever, can hardly even remember that it actually does, but I've made it sort of a must to install to the latest patch before running a game and never patch games that have been run


G