Update video driver?

I'm trying to update my video driver for my Sony Vaio VGN FW. I have a ATI Mobility Radeon HD 4650 with Windows 7 64 bit. I get it off the website but when I try to install it, it says I don't have the right one. I don't know what to do and it's not letting me play Serious Sam HD because when I open it, it says to update my driver.

Was it the ATI/AMD site you went to? The link to the drivers are below if you hadn't been there.

http://support.amd.com/us/gpudownload/windows/Pages/radeonmob_win7-64.aspx?type=2.4.2&product=2.4.2.3.30&lang=us&rev=&ostype=Windows%207%20-%2064-Bit%20Edition

Hmm you may be stuck as Sony havent updated the drivers since 2009,I'll take a look around though.

By the way what is the full model name of your Sony?