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to burnout426 I tried some of your suggestions a couple of days ago, & waited to see if Opera reappeared. I'm happy to say it hasn't so your methods seem to have worked. Many thanks. I may try Opera again sometime but I use Chrome & Duckduckgo, and occasionally Firefox. I'm not huge computer user so that's probably enough for me.
@burnout426 Thank you for your suggestions. Before I saw them I remembered that I have CCleaner. I used that and managed to uninstall Opera, using the uninstall option, along with cleaning the registry which seems to have completely got rid of it.