Since nobody else has replied, i'll have a stab at it.
It could be that you have software on your machine that blocks registry entries, if this is likely try disabling such programs and re-install Rome. Also i recommend disabling your internet temporarily, and turning off any Anti-virus, Anti-spyware, malware, as these programs might be blocking certain files or registry entries.
Failing that you can try using this registry file from my Rome installation, if you use it, backup your Registry first, and make sure the install Directory for Rome is the same as in the Registry file : C:\Program Files\The Creative Assembly\Rome - Total War
http://rapidshare.com/files/405020461/Rome-gold.reg
Best of luck.
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