Lenovo S400 screen brightness darker on Win 7?

So I recently bought a Lenovo S400 that came with Windows 8 for someone.  However, he didn't like Windows 8 so I installed Windows 7 on it.  After installing all the driver, the screen for some reason got darker.  It seems like the lowerst the screen brightness can go and the hightest the screen brightness can go got lowered.  I thought it may have been a driver issues so I uninstalled and reinstalled all of the driver without any luck.  So I just formmated the computer again but still no luck.
Does anybody have any solutions for this?

***UPDATE***
Ok so the problem is confirmed! As soon as I restored Win 8, the screen brightness was set at 65%, I was quickly able to turn it up to 100% and the screen is as bright as ever. So it is now definitely not a hardware issue but an issue with Win 7 drivers Lenovo provides.
Now, I will try getting all the drivers off the hidden partition and try restoring my Win 7 back and trying that Win 8 driver. If that works, I will upload the Win 8 driver for everyone and post a link.
But, I definitely discovered the cause. It's drivers!
PS
In fact, I will post the driver if I find it now, so you guys can try it out before I do the Win 7 restore again.
Hmm, the only problem now is I can't seem to see the drive with the drivers on it. I know I had it before, but I can't see it now, I recreated all the partitions Lenovo came with, keeping exact sizes, but I can't seem to assign a letter to any of them through standard disk management app.
Ok tried viewing the hidden partitions.... I just remembered that I was stupid and didn't backup the D drive, which is where the regular OneKey Backups go and the drivers were in that folder as well.....
So if anyone has Win 8, please upload it somewhere, preferably dropbox or mediafire, so I can test it.
Because it'll be a long time before we get it from Lenovo and I really hate Win 8!

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