Movable virus - cannot log off or shut down - Avast cannot locate & destroy - HE

I have a ’ movable’ virus on my computer. Avast tells me this but cannot seem to locate or destrot it - Help please PLUS my a-ball icon is Grey NOT Blue as it should be!

Don’t worry about the colour, it looks blue grey on mine too, worry if it isn’t rotating when files are scanned or not there. A lot depends on your graphics set-up, display card, monitor and background colour.

What is the exact message, a screenshot might help ?

Check the avast! Log Viewer (right click the avast ‘a’ icon), Warning section, this contains information on all avast detections.