Once again I'm having problems. I haven't been mining for a while, because I've been having so much trouble with the ATI drivers.

Now I have made myself even more trouble - because Windows 7 seemed to cause a lot of trouble, I installed XP instead. After all, it worked with XP and the ATI radeon 4850 on my other computer.

I began with making a ghost copy of the drive when Windows was installed, mainboard drivers installed and W. Update done. If something goes wrong now, it's easy to just reset it.

I put the 6770 in, to try to get that running to begin with. I installed the last version that supports both the 4850 and the 6770: Catalyst 12.4. It explicitly says on the page that the installer includes OpenCL support. But when I install it, it doesn't have a checkbox for that.

Anyway, I continue to install a Stream SDK that I find (There's no APP SDK for XP.) and it says that there's no compatible OpenCL driver on my system. I installed it anyway. Of course it didn't work. I found out that it was a too old version that didn't support the card. Lesson learned: take the time to READ...

Well well, I found a newer version: Stream SDK 2.2, that should support both this card and the 4850. BUT IT TOO SAID THAT THERE IS NO OPENCL DRIVER, or if it said OpenCL GPU, I don't remember, so it would only be possible to use it with an OpenCL compatible CPU.

That's where I am now. GUIMiner only have the CPU in the list of units.

Please help. Didn't I get the OpenCL driver in the 12.4 install package, or did the old Stream SDK screw something up? It feels pretty meaningless to reset from the ghost copy, only to get the same problem again if it is so that I didn't get the driver in the first place.