Try this as it worked for me. Make sure you have a copy of OpenCL.dll in C:\Windows\system32. If not, follow the instructions below to see if you have one locally.
Basically, do a search for OpenCL.dll in C:\, hopefully you'll see at least one match in the driver directory or even in oldwindows dirs, if so, just copy one from the driver directory and past it into the C:\Windows\system32 and you should be good to go. I picked one that had 4 - 500K size.