Thank you mike20021969 for your helpful reply.
I had previously googled the error message, and didn't find it helpful at all :agree:
It isn't Corel PSP that is causing the problem, I have restored my system to a time before installing PSP and the error message still appears.
The problem seems to affect CloneCD and CloneDVD only. all my other programmes open ok.
I was hoping that other users may have had the problem, but it seems not. I cannot be sure how long I have had the problem, I haven't had a need for CloneCD or CloneDVD for some time, maybe a couple of months, so it is going to be hard to track down exactly what is causing the problem.
I hoped that because it seems that it is only Slysoft products that are affected, someone here would be able to offer advice. By the way AnyDVD is opening ok.
I have tried a new download of CloneCD, It made no difference.
I will keep trying to find the cause, and if I an answer I will report back here, just in case it helps someone else.
Thanks again.