system
7
Many thanks Pondus - your link worked for me (I think, touch wood etc).
I used method 2 - renaming the “wmi” file (was called bdj.exe in my infection)
Then installing Malwarebytes of a flash drive using the suppied regedit fix (had to rename it to MWB setup to explorer.exe to get it to run)
It found 5 items - rebooted - managed to connect to the internet and download the latest updates for MWB - scanned again - found 2 more items.
Rebooted - now performing a fullscan. Looking good so far. By my confidence in Avast has been severely shaken.