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What do you mean ¨I have to change it¨, the game won't work and displays a ¨Your vga graphics card is crap¨ message, or something like that? In that case, you'll probably need an accelerator card like Nvidia Geforce ones, altough I didn't know that Sims 2 wouldn't work with the Sis onboard card.
If the game displays a list of compatible graphics cards and yours isn't in it, then you'll have to get yourself one of those.
Have you tried upgrading your Directx version? Which one do you have? Probably the game did this already, but check it out.
¨go to the sight¨...you mean ¨go to the site¨, right? Where are you from? I'm from Argentina.
...Enjoy the Silence.