Avast Won't Delete a File, Claiming it is "Read Only" Error 6009

[REDACTED]

Hi!

I've got Windows 10, and I've recently been fighting some malware (background ads, among other things) and Avast just found a file that it refuses to delete or move or fix.  c\windows\syswow64\dnsapi.dll ;Avast calls it Win32:Patched-AWK [Trj] and won't fix it because it's read only. Trying to do anything with it prompts a box telling me it's a virus and Windows won't touch it. Help?

[Eddy]

Sounds like the ShopperZ malware (or a variant).
Follow these instructions > https://forum.avast.com/index.php?topic=53253.0