@blackbird71 Exactly, I set the Chrome as my default browser, and as nothing happened, I repeated the operation using Edge. I'm sorry I was not clear enough...it's been a while without using real English. Thank you for your response.

@blackbird71 Thank you very much for your quick response. I did change the browser to Chrome, but ot still pops up in Opera once the system is started, Then I changed it to Edge with no different results; so I guess I have a malware rooted somewhere in there. I have tried a number of Malware and AntiSpy apps, but they either ask you to pay to have the fully functional app or simply are unabe to find that malware. Suggestions are gratefully accepted!

There is this gambling site which pops up everytime I start Windows.
I have tried a number of solutions; from blocking Opera at Start up to installing antimalware apps in my computer, but no good resuts have come up.
Can anybody help me?
Thank you all n advance.