Many thanks for your interest and help.
The problem did appear to be with Recycle Bin. I finally managed to sort out the proper cmd prompt which cleared the bin and when I tried a reinstall of the offending programs, both went through without incident.
I can only assume that those two programs needed to get rid of certain temporary files (created as part of the install) before being able to progress any further with their install. With Recycle Bin being unable to clear, both came to a halt at that point. Although I must admit, that is tailoring an answer to the result rather than the actual problem.
Anyhow, everything is up and running as it should be doing. Once again, I thank you for your interest and help.