1) Are the subtitles hardcoded in the movie file or they are separate .srt/.sub files? If they are separate, do you have the right language files? Also, copy the subtitles file to the same directory as the movie and make sure they have identical names. Thats all thats required.
2) The turbo boost driver is required for i5 and i7 series processors with integrated graphics. Core i7- 720, 740, 820 and 840 dont have integrated graphics so this driver is not required. You havent specified but I'm guessing you have one of these processors, hence you are correctly getting that message.