Hi Nigel, welcome to the forum
This is the VRDB icon that was present in avast! 4.8 It is possible to hide it by right clicking on the avast! icon and finding merge icons or something similar...
IIRC when you right click the 'a' icon there is a VRDB option and in that menu there is an option to merge the two...
I know that this thread is in the ADNM section so I could be mistaken, but is there any reason for not using avast! 5? It has been out for a while now (and is the reason for my being a little vague above, apologies)
Scott