Ideally, we need more information from you to better understand your situation.
Is your Radeon HD 6850 able to POST? If so, are you able to install from the link provided? Can you provide more information on any actual errors that you see?
AMD Catalyst Driver Windows® 8 Release Preview
Note! This driver is provided "AS IS" and under the terms and conditions of the End User License Agreement provided therewith.
If the issue continues, please submit a report directly to us for further review or call us directly.
AMD Issue Reporting Form
AMD Global Technical Support
AMD Customer Care
The information presented in this document is for informational purposes only and may contain technical inaccuracies, omissions or typographical errors. Links to third party sites are for convenience only, and no endorsement is implied
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