sounds like a bad card
I have two cards, 1 that works great for last 3 months of mining, and 1 brand new card that worked great for 24 hours of mining. I was "breaking in" the crossfire setup and hadn't yet overclocked anyone. Tried both card separate and neither works. Cards are both perfect.
The SDK tools will have to be installed to mine opencl.
I would try uninstalling whatever SDK tools you have on there and figuring out how to get the tools properly installed.
There are some pretty good reads out there on getting SDK and drivers removed for a new clean install
How many ways can it be installed, I did a total removal of SDK and all graphics drivers about 5 times and reinstalled using new versions, old versions and different combos of both. Still did the exact same error the whole time. Also, when it was functioning 100% correct with both cards, I never changed any drivers or SDK...