First, uninstall the intel OpenCL driver that you previously installed.
Then, restart your computer, and install the AMD OpenCL driver that Chris linked.
Give US2 a test with the new OpenCL driver, and see if that works for you. If not, uninstall the AMD OpenCL driver, and you should be back to where you started. If you're still having problems, you'll just have to wait until we can issue a fix for the CPU integrator.