Windows 7: Audio Works in Ubuntu but not Win 7 (Device not detected)

I have a Lenovo Thinkcentre M55 8813-a21 (LKRYA75). The sound works just fine in any Ubuntu installation i do, but I cannot get sound in either XP or Windows 7. I also couldn't get the networking drivers to work in XP so I am now on Windows 7. I have tried the driver download page on the Lenovo website, but none of them work. I don't know where to go from here. Thanks in advance.

For this computer, I see audio drivers for XP, 2000 and Vista, but not for Windows 7.

I saw this as well, I am just wondering if there is any way to bypass this with compatibility mode or any other method to port the vista driver to Win 7?

If the Vista driver doesn't work (and that's not unusual), and if you can find the manufacturer of the sound card/chip with a Win 7 driver, you might not be able to have sound in Win 7. The good news is you can purchase an inexpensive sound card to run in your system. Just make sure it's compatible with your computer and Windows 7.