In this case under the download links for drivers provided by the Computer Manufacture there should be one called BIOS. I see that for your computer there are driver listed for Windows 7 32 bit only. Here you can download the Latest BIOS:
http://support.lenovo.com/en_US/research/hints-or-tips/detail.page?DocID=HT073549
You can also provide the graphics report or dxdiag report to know your graphics controller.
How to get it?
Dxdiag Report: Type dxdiag in Start Menu> open> Save>
Graphics Report: Right click on desktop> Graphics Properties> Options> Drop Down Menu> Information Center> Save>
Please attach the files here.
Kevin M