avast unable to start scan no more endpointsavailbale from the endpoint mapper

I get this message when I try to scan with my avast
I use Windows 8 on a Toshiba Satellite
I do need the scan to remove malware it seems I am having right now (each time I try to access my gmail some rewardzone thing appears instead, which is annoyind and I need to solve soon
Any suggestions on what to do?
Thanks,

How to recive help instructions https://forum.avast.com/index.php?topic=53253.0