Went through the Service & Start up sections as suggested. All Service files loaded without any adverse effect. The Start up file however gradually got worse as I added more files. Conclusion: Too many Processes trying to out do each other. I went through them and decided what was necessary or not, ensuring that anything I was unsure of, stayed selected.
So far the system is running OK so I hope I have resolved the issue for a while. I'll keep my eye on the Processor in future and housekeep as necessary.
Thanks again for your help, it was really appreciated.