Buteman, Thanks very much for that link. Yes, I should have 'Googled' before posting, of course!!!
I shall read the articles there. I like the WinKey + L, but then I can't continue reading what's on the screen, ie when using the PC to help me complete a crossword (poor example, I know).
So, thanks for that. Maybe I'll find what I'm looking for in there but, in the meantime, I hope someone can come up with how to just lock the keyboard, but leaving the screen open etc.
I should have said in the first post, that I have Acer Aspire 5738Z. Maybe I need to Google the model or phone Acer. I have read the manual but can't find this info.
So, keep suggestions coming, please guys ...