I would just try installing the patch over again, it looks like something went wrong when it did the first time. If it will not let you, uninstall the game, reinstall it, then patch it.
Also, what version was your game at before you installed the 1.5 patch? If it was at 1.0 thru 1.2, then you need to install the 1.3 patch first, then the 1.5 patch. Otherwise you will have problems.
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