I know Cryptodan asked you to post a Speccy screen shot which would have made it easier to direct you to the correct driver download for your graphics card.
However I am going to post several links for your graphics card, each one is for a specific version of the Windows operating system.
Pick the correct link for your operating system below.Windows XP 32 Bit OShttp://www.nvidia.com/object/winxp-260.99-whql-driver.htmlWindows Vista and Windows 7 32 Bit OShttp://www.nvidia.com/object/win7-winvista-32bit-260.99-whql-driver.htmlWindows Vista and Windows 7 64 Bit OShttp://www.nvidia.com/object/win7-winvista-64bit-260.99-whql-driver.htmlDirections
Download the driver from nVidia's web site and save it to your DESKTOP
Go to Control panel
look for Device Manager
look for Graphics adapter
and un-intstall the driver for the video card.
Your graphics display will be generic basic colors, might even be 600x800 pixels. Do not allow windows to install any drivers, cancel the install if windows attempts for load drivers for you.
Look for the file you downloaded earlier to your desktop from nVidia's web site.
Double click the file and follow the on-screen prompts to accept the terms of the EULA license and allow it to install.
Reboot the computer when prompted to do so.
You have just updated your video graphics card's drivers.
Hope this helps.