U460 Brightness Control Issues (Only goes from Brightest to Darkest)

My Ideapad U460 is having problems with the brightness level. It will only switch from the Brightest to Darkest brightness level...meaning it's either too bright or too dim. I've tried switching my power options too but everytime i try to adjust the brightness either by just clicking the "Fn" button to adjust the brightness or changing it on the Control Panel's Brightnes Options by moving the cursor down the brighness scale (it STILL only goes from the lowest to highest in brightness).
Please help! This is quite frustrating since it goes from being WAY TOO BRIGHT to WAY TOO DARK. Also, I recently had my screen changed because it was malfunctioning. Everything is fine in terms of my memory and just the laptop itself but the brightness issues are becoming unbearable. THANKS IN ADVANCE FOR THE HELP

Thanks for the help! Sorry, I've been out of town so I haven't been able to respond. However, I have some questions.
How do I update the Graphics driver and Bios of my system? Are both updates through the link you provide?
Also, how do I know which Graphics Drive to download (I attached the different drivers I see below)? I have Windows 7 on my Ideapad U460. And where do I update the Bios?
Intel Onboard Graphics Driver
8.15.10.1840
2010-09-08
25.1 MB
Windows 7 32bit
Download
Add to download list
! Lenovo recommends you to read the Important infomation
Intel Onboard Graphics Driver
8.15.10.2086
2010-05-20
39.3MB
Windows 7 32bit
Download
Add to download list
Intel Onboard Graphics Driver
8.15.10.2086
2010-05-20
41.2MB
Windows 7 64bit
Download
Add to download list
Intel Onboard Graphics Driver

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