Installing Sims 3 Showtime problem

Hi. I am trying to install The Sims 3 Showtime, when I try to complete step 1 from your installation guide I get an error message that I totally took a picture of and attempted to attach to this post but the rules of the forum say I can't post links because I am a new member. So I will just type to you what it says:

>SetupNew\setup.cpp(14)
PAPP:
PVENDOR:
PGUID:
$15.0.0.498
@Windows Vista Service Pack 0 (7600)
IE Version: 9.0.8112.16421

I have Windows 7 so I don't know why is says something about Vista. My base game is legit. Can't think of any other info you might need. If anyone on here could help that would be fantastic.

Hello,


Please open the .rar file you downloaded using only WinRar, which can be downloaded from www.games4theworld.org . (If you use any other software than WinRar, like WinZip or 7-zip, the files will get messed up!)
When
you've opened the file using WinRar, select áll the files in it and
drag & drop them to a folder on your Desktop. When the extraction is
done, close the .rar file and open the folder on your Desktop.
Now,
start by reading the included "# Installation Guide.txt" and you should
be able to get the game to work yourself. Good luck!