I'm running Vista, and RTW installs as 1.5. I've also installed mods. I'm wondering if you found the "Run as Adminstrator" option for patch installs, it may give the rights which are needed.
When I installed BI it seemed to downgrade RTW to 1.3, the game ran ok, but I didn't try the 1.5 patch install to get to current RTW version.
Good luck, I agree with those who found bribery generally inefficiently expensive, only useful when taking a wider picture of more speedily winning a strategic campaign, and preventing enemy from organising an effective response to my invasion moves.
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