It rather depends where the problem exists - e.g. are getting an Avast Alert and if so which Avast Shield, commonly this would be either the File System Shield or the Web Shield.
So attaching a screenshot of the alert window (with more Details selected) or blocking would help.
Attaching Images to your post - When you Click the Reply button it opens a text window for you to post your comment (reply or post).
Click the Preview button, that shows what you have input and expands it to include 'Attachments and other options'. Click that it further expands, here you can attach images, etc. at the bottom of your post.
See my attached image, click to expand.