Go to the link below and download the Display Driver, AHCI Driver and Raid Driver. Follow my map so you won't be too confused. It's right under the link.
Drivers & Support | GAME.AMD.COM
The Display Driver can be found under: ATI Radeon Video Card Drivers > Indivisual Catalyst Components > Windows 7 link.
AHCI and Raid Driver can be found under: Mother Board/Intergrated Video Drivers > Indivisual Driver(MotherBoard/Chipset) > Windows 7 link.
Next you will need a flash driver, cd, or floppy because you are going to copy the driver there. But please keep reading, because we are not going to copy the catalyst, we are going to go straight into the folders and get the drivers.
Next go in your C drive. Go to ATI. Go to Support. All your drivers are there. Now find only the ones you downloaded for this installation, should be no more then 3. Ahci, raid (don't really need this one) and Display.
Go into the folders. Then go to packages, then drivers, keep clicking the right folder till u get to the name of the driver you looking for. Here I'll map out the route. I'm going straight to the 32bit drivers, so common sense should be able to tell you how to find the 64.
Alright, the first folder you will have to work your way into is the 9-10_vista32_win7_32_dd folder.
Click 9-10_9-10_vista32_win7_32_dd > packages > drivers > display: (You ill see a W7_INF (32bit) and/or W76A_INF (64bit) folder, copy one of the two to your flash, disk or floppy.
Now the next folder will be 9-10_win7_32_64_ahci so...
Click 9-10_win7_32-64_ahci > packages > drivers >SBDrv > SB7xx > AHCI (You will see the folder W7 (32bit) and/or W764A (64bit) copy one of the two to a flash, cd or floppy).
Last but not least if you need it the raid driver. We will not be loading this driver but you should put it on your flash incase u need it after installation.)
Click 9-10_win7_32-64_raid > packages > apps > VC8RTx86 > vcredist_x86 > (you can copy this on you flash for after you install windows it will not load as a driver).
Alright, so after you saved the drivers to a flash, floppy or burned it to a disc. Run windows setup. Click the version you want, click clean install (don't worry, it will save all ur old files and programs to a folder titled 'windowsold'.) Select the partition you will like to use so windows can temporary install it self on while its setting up. (I recommend drive C anything else may screw things up). DO NOT CLICK NEXT!
Now, you will notice at the bottom of the same drive choosing screen you see something that says load drivers. This is where ur display and ahci driver will come into place.
Click load driver, click browse in the pop up, go to whatever you use to load your drivers on. (if you used a cd, it is okay to take the windows 7 cd out and put the cd in you put the drivers on. but after we load all the drivers, before anything put the windows 7 cd back in and let it run for a few seconds to catch up).
Once you have clicked brows click on which ever you saved the drivers to. Click the AHCI folder, you should see either a another folder that says 'W7' (32bit) or 'WT64A (64bite). click which ever one you are trying to install then hit okay.
Drivers will come up under the Select driver to be installed. If you do not see drivers, that's okay because on some laptops you will have to uncheck the box right over the browse button that says 'Hide drivers that are not compatible with hardware on this computer.' (they are, just not tested yet which is why we have the AHCI RAID CONTROLLER PROBLEM).
Alright there should be two drivers. Click on the first one, hit next. A warning or something may pop up, just click okay. It takes you back to drive select screen, make sure its on the C driver again and hit load driver. Go back to the same folder and load the second one.
Next we gotta do the second set of drivers. So go to load driver, browse, look for the'W7' (32bit) or 'WT64A' (64bit) folder. There will be three drivers. remember if you do not see three you will need to uncheck the 'Hide drivers that are not compatiable with hardware aon this computer,' box. Load all three just like you did the other two.
Note: It will not show what drivers you loaded, but they will be loaded.
Finally, like normal after you load the last driver you go back to select drive screen, again make sure C is selected and click next. Hopefully you are on your way to a succesful installation of Windows7.
Let me know if any part of this confused and I'll be glad to help you. Any question just post or hit me up on yahoo.
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Yours Truly,
B3astiie

The package provides the installation files for AMD AHCI Compatible RAID Controller Driver version 3.3.1545.14.
In order to manually update your driver, follow the steps below (the next steps):
1. Go to Device Manager (right click on My Computer, choose Manage and then find Device Manager in the left panel)
2. Right click on the hardware device you wish to update and choose Update Driver Software
3. Choose to select the location of the new driver manually and browse to the folder where you downloaded the driver