Repeated threat secured messages

Hi Terry,

We're glad to look into this & help you.
Please visit your post in a different browser to check if you're able to upload the screenshot here. If not, let us know, we'll send you an email requesting the screenshot of pop up to proceed further.

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I keep getting threat secured pop ups when trying to check my yahoo email.  They come up any time I load the yahoo home page.  I don't see how to put a screenshot here because the picture add icon wants a web address.  I ran a full scan of the computer and it was fine.  Why is this happening?
Everything is up to date, the computer has been scanned and restarted several times.  I also reset my browser.  I am still getting these messages.  I see alot of other people on here have the same problem.  
Hello Terry,
Thank you for providing us the screenshots.
We regret the inconvenience caused. We will check and help you.
Have you tried updating the virus definitions? If not, we suggest you to do so.
Kindly follow the below steps to update virus definition then restart your PC and check the issue.
Open Menu > Go to settings > Update > Check for updates
If you face any difficulties, please get back to us and we will certainly help you.
Thank you and keep us updated.
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Thank you for writing us back, Terry.
We apologize for the inconvenience.
It seems that the detection is correct. We will escalate this to our higher team to a get fix.
In order to do so, we need to collect AVG logs from your PC.
We've sent you an email with further details. Please check your inbox/spam folders to find the email and use it to get back to us.
Awaiting for your response.

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This is the message
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