T420 Headphone Jack won't work in Windows 7

Hi all,
I've recently got a T420 4180A32 (Conexant CX20672) and the headphone jack doesn't work under Windows 7. It works when I boot (natively) into Ubuntu, but obviously when I run a Virtual Machine into Ubuntu through Windows, it doesn't work either.
I have:
- Uninstalled and reinstalled the driver version that came installed.
- Installed, Uninstalled and reinstalled a newer driver version.
- Uninstalled the old driver and installed the new one.
- Reverted to using the generic High Definition Audio driver. The speakers work fine but again, headphone jack doesn't.
- Established that it obviously isn't a hardware problem.
- Uninstalled then reinstalled DirectX
- Tried various headphones on the off chance that they were the problem. They weren't.
I haven't:
- Done a full reinstall of windows 7 (although I might)
- Tried Windows 8, although again, I might as I have an unused licence for it and I really want my headphones to work.
That's about all the info I can give. Besides this problem, the laptop runs great!
Any help would be appreciated.
Thanks

I have now noticed that when using ubuntu the headphones work but that won't mute the speakers, so I am starting to think it could actually be the jack, as the headphones, as a device, arent dectected by ubuntu either, they just work because they are plugged in, I guess it's the way each OS works.
Check if that happens in your computer as well. Also, where did you check the prices of compatible sound cards? Which should I buy? I may go to a Lenovo store to get it fixed.

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