ok, i keep getting two errors.... they read;

"Destination directory is not valid. Please choose folder where Rome Total War was installed. Do you want to proceed (click yes only if you have expected this error)?"

the second one is "It is not recommended to install Europa Barbarorum in Program Files Folder. Do you really want to proceed?"

both of those errors appearing after folling your advice and locateing the folder (and path) of "C:\Program Files (x86)\The Creative Assembly\Rome - Total War"

god this worked fine on my pre-vista computer!