crazyates
i used and 12.8 drivers with 2.7 SDK and 11.11 with 2.5 SDK - no result((
will try 12.4 with 2.7 SDK tomorrow.....
with other drivers except 11.6 my comp reboots((
Well IIRC, scrypt requires 2.6 or newer, so 2.5 is out. 12.8 with the included ocl runtime should be your best bet. Idk then.

All done!
So the issue was in APP SDK and DRIVER
On my XP only APP SDK 2.7+Catalyst 11.6 was succesful
All other combinations was not working
but cgminer gave me only 140 khash but reaper 410 on my 6950
it's all i could squeeze out of cgminer....((
reaper was better.. don't know why...