Mining with 6850 ok but my 5850 crashes cgminer

[Frogwithcancer]

After installing 12.8 drivers i get the following from GPU-Z
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GPU-Z
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ATI OpenCL driver bug detected, skipping OpenCL detection.
Uninstall the AMD Stream SDK / OpenCL driver to re-enable this functionality.
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OK   
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any ideas?

I have the AMD-APP-SDK-v2.5-Windows-641.exe should i instal this as well?

[Frogwithcancer]

Ok now I'm stuffed. Uninstalling the drivers and putting 12.8 on has messed things up completely. Installing 13.5 does not help either.

Help.

[Frogwithcancer]

installed the 2.8 drivers and it's back up and running. i'm now getting 322 out of my 5850 at I 18