If you look at the nvidia website, they don't have a driver version for the 440mx for Windows 7. Which means your best bet is to just upgrade. I would say upgrade the video card, but with the MX 440 being an AGP card, I think you should just get a whole new computer when you can.
You're stuck with the drivers Win 7 has for that card. Not only that, but that is essentially a DX 7 card and thus won't support any of those nice Aero effects no matter what driver you use since you need a DX 9 card for that.