For Windows I believe you have to track down aticalcl.dll, aticaldd.dll, and aticalrt.dll in Windows\system32, then copy them to your work folder and replace the ati with amd in the file name. I thought guiminer came with the files already.
If you provide some output from cgminer, I (or someone better) might be able to help.
When you say work folder - do you mean the highest-level directory (i.e. /guiminer) or one of the /lib folders?
I would give any output from cgminer, however it crashes immediately - via the opaque "Application not responding" screen mask. cgminer-nogpu appears to start working after prompting for URL, worker U/N and pass.
However, I'm pretty sure it's not doing anything, as even with deliberately taxing settings I came back 10 minutes later with the fan not anywhere above no-load idle. This stock 1366 sink is a menace and can wake a neighborhood, and I couldn't even hear a whisper from it.
But, provided, name them as:
amdcalcl.dll
amdcaldd.dll
amdcalrt.dll
?
Thanks for your help, BTW. It's much appreciated.