My situation has got worse.
I found 2 lines of strange squares and Symbols in the MSCONFIG startup list relating to the Registry Entry: HKCU\Software\Microsoft\Windows NT\CurrentVersion\Windows: One is RUN / One is LOAD.
I've also lost all my 'Restore points', and now my 'Internet Connection' has vanished. [i'm having to use a
different PC to post this].
I must have more wrong with my machine than the 'Winlogon#Taskman' problem. I'm going to Format and do a fresh
installation of my software.
Thank you both for the info and suggestions, I hope you get things sorted.