I have an ati radeon
I've never seen a Radeon "ed6600" videochip, and can't find one listed ANYWHERE, so I suspect you've misidentified your GPU. You MIGHT have a Radeon HD6600M GPU; you can download the drivers for it here:
Open that page, and click on "Find a Driver" in the upper-right corner of the webpage.
The "Component Category" for your video card is "Notebook Graphics"
The "Product Line" is "Radeon HD Series"
The "Product Model" is "Radeon HD 6xxxM Series"
Lastly, choose the operating system you're using; Win7 32-bit, Win7 64-bit, Vista 32-bit, Vista 64-bit, or Win XP 32-bit. Select your operating system, then click the green "View Results" button.
The next page that opens will provide a direct link where you can download the drivers for your Radeon videocard. BE SURE to read the Release Notes and the Installation Instructions BEFORE you begin the driver installation.
Keep in mind that Windows must reboot when changing drivers, so DO NOT try to delay the process. Windows deletes a LOT of old files during the reboot so that they won't conflict with the new driver files being installed. If you delay or interrupt the process, you could have an unbootable mess on your hands.
Best of luck with this; let us know how it turns out.
on Apr 25, 2011