Get the latest driver 17.12.2 from the official AMD website, alternatively use the beta blockchain driver.

In case you decide to go for the 17.12.2 driver, don't forget to set it to "Compute" mode (default: "gaming") under Games/Global Settings/Global Graphics 570/GPU Workload in the radeon settings.

While you're at it, update claymore to v10.3 (works fine) or the brand new 10.4 (haven't tested).