Radeon HD 6850 Win 7

[epixoip]

Those threads are over 3 years old. Again, AMD dropped support for all non-GCN GPUs in November 2015.

Crimson 16.2 does not support the HD 6850, https://support.amd.com/en-us/kb-article..._16.2.aspx

The last driver to support your GPU was Catalyst 15.9