Spreadsheets Read-only

Hello Sharon,
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Please ensure the AVG Internet Security is latest version.
Updating Virus definitions and AVG AntiVirus application version
Thank you for your understanding.

Hello Sharon,
Thank you for reaching AVG Support Community.
We will certainly look into it and help you.
For better clarify, please share the screenshot of the AVG pop-up which you receive while accessing the file. If you received the threat pop-up, please click on "See details" in the threat pop-up and share the screenshot.
 If needed, please find a quick guide on how to take a screenshot here.
 You can post the screenshot here in your topic. Click on "Answer" & then click on the "Image" [mountain symbol] & follow the instructions.
Please ensure the AVG Internet Security is latest version.
Updating Virus definitions and AVG AntiVirus application version
Thank you for your understanding.

AVG popped up with a warning asking me to okay it, which I did, thinking it was a virus threat etc.  However, ever since, my spreadsheets say they are read-only when I try to save them.  The check box for read-only in properties is not checked.  Have googled and seen avg has caused this.  Tried their correction, didn't work.  Also tried to Reset to Default.   Anyone know what's happened.