OK, well that error message isn't saying your install is in the wrong folder; it's saying there's a problem with the text in one of the files. Apparently, this also happened with another person earlier; see thread
http://www.twcenter.net/forums/showthread.php?t=480093. Maybe that will help. Pretty sure.. yeah, it was Brusilov that solved that one too, I think. I'm wondering though, if it isn't actually the RS install that's corrupted, as this seems to be the same exact error message for 2 people in one day; maybe one of the download links is busted? try using a different download source, and see if that helps; pretty sure there were a couple to choose from.