^ Almost positive the 200m is a mobile variant of the 200 a stand alone card can't be installed.
I went to AMD's website and looked up a driver to see what I would get, it brought me to this page of legacy devices no longer receiving new drivers.http://support.amd.com/us/gpudownload/windows/Legacy/Pages/integrated_vista32.aspx?type=2.7&product=220.127.116.11.2&lang=English
" AMD’s DirectX 9 ATI Radeon graphics accelerators are not officially supported under Windows 7. If the user chooses to, they can install the ATI Catalyst Windows Vista graphics driver under Windows 7. "
There is a 2 year old driver there for Vista that may work fine under 7 if you want to try it, but AMD doesn't officially support it. I know from experience that most Vista drivers worked in 7, so it's worth a shot to try.