I believe it's driver (software)
Tools > Internet Options > Advanced Tab
Uncheck Use Software Rendering instead of GPU Rendering
Click Apply, Ok
Reboot
Open Device Manager and rollback to previous driver
Hotfix -
http://support.amd.com/us/kbarticles/Pages/AMDCatalyst116bHotfix.aspx
How to install AMD catalyst software on a Windows System
http://support.amd.com/us/kbarticles/Pages/GraphicsDriverInstallationInstructionforMicrosoftWindows7.aspx
This article provides instructions on how to use / resolve issues with enabling the scaling options in ATI Catalyst™ Control Center to allow the display to be set to the desired mode.
http://support.amd.com/us/kbarticles/Pages/UnableToSetGPUScaling.aspx
I also suggest you contact ATI.AMD support for assistance
http://support.amd.com/us/Pages/AMDSupportHub.aspx