You are out of luck. The G41 chipset/graphics are not supported on Windows 10.
Look way down this page under "legacy":
If your machine is a desktop, and you have a PCIe x16 slot, you might be able to find a compatible graphics card (nvidia or amd-based) that could work with Windows 10. While most manufactures of these cards claim backward compatibility, many are not compatible.
However, the best thing to do is to get current. Get a new/newer machine that is supported on Windows 10, and avoid the problems.