NIS Scan won't complete - winsxs/IE/Adobe Flash player update

I believe I have a virus in my C/Windows/winsxs folder.  The symptoms I am having are:

 

Norton IS won't complete its scan - gets stuck in the winsxs folder

Everytime I move to a new page in Internet Explorer, I get a new window asking whether I want to update Adobe Flash Player

I have been using Google Chrome, which doesn't get the same popup

I have downloaded Malwarebytes and that also gets stuck in the winsxs folder

I have tried other virus scans andmalware removal tools, all ar egetting the same problem

 

Please help!

 

Thanks!