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I think, try an older catalyst (use the AMD Catalyst uninstall utility to remove 13.1 driver), because 4xxx cards aren't supported by current OpenCL stuff, and also they were always got beta OpenCL support.
Maybe a 2011 driver is ok. (and also an sdk from these times)
As I know, today, the fully supported hardware with the latest drivers are up from Evergreen(HD5xxx+).
And of course HD4xxx is good for graphics (I have an 1TFlops/s card too, and it's still really good), but those cards doesn't got the flexibility (for example: many UAVs, memory atomics, multimedia instructions) that OpenCL would require.
You were right about removing 13.1 and re-installing an earlier version. Everything is working now with
Catalyst 12.2. After more reading, I think that maybe a complete uninstall and re-install of 13.1 might
also work. Some problems seem to have happened because 13.1 does not properly delete some files
from earlier versions before it installs, So possibly anyone who is upgrading to 13.1 should do a
complete removal of AMD and ATI before installing 13.1. I have not tried this yet but if I do and I can
get 13.1 to work, I will post here. It has been reported that 13.1 OpenCL is slower than previous
versions. I am a little suspicious that there may be something funky about this release installation
Anyway, thank You for pointing me in the right direction. I have solved my problem for now.