Thank you for the reply.
I thought that it might have something to do with the opencl and the fact that AMD did stop OpenCL support for the 4600 series in their latest drivers.
But I thought that my particular computer would be alright as long as I don't update the drivers as The Collatz Conjecture uses OpenCL.
Which is why I am at a loss to work it out.
I did try an download version 10.2 legacy drivers from AMD but they wouldn't install at all. I am reluctant to uninstall the current drivers, as I can't remember what version they are and I can't seem to find out, but they appear to be working. (I can find the versions of the individual files but not of the overall package of drivers)