Hello, recently I have been unable to view Pdf files in the preview pane. I have tried unticking and re-ticking the option within Adobe (my default viewer). Is avast likely to be stopping this. The preview pane has an error message ‘The file you are attempting to preview could harm your computer. If you trust the file and the source you received it from, open it to view its contents’
I only try to preview pdf files that I trust so can I disarm this security feature?
Please can you respond in laymans terms as I am not a computer wizz 
Many thanks for any help