Unable to open any attachments

Hi i use yahoo mail as my default,when i receive any attachments from trusted emails i can accept it,it then does a virus scan with AVG Which goes ok,but then it askes do i want to open or save it,when i do open it,it goes into running security scan,but never finishes it & carnt open it please help,:thanks:
 

soson

New Email
Hi,

I think that the problem is in your navigator navigator.
Have you tested with Chrome or Firefox.
 
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