I've given up on trying to remove the occasional virus, trojan or any other serious PC problem. I don't trust any of the anti-virus or security programs to stop the PC getting infected in the first place, or to remove anything which does get through.
So all I do, is revert to a backup copy of Windows and all my other main programmes. I do this once or twice a year and am back in business within a few minutes.
Moreover, I deleted AVG and other 'security' products. The PC runs faster without them, and the incidence of problems (suspected virus or trojan) has gone DOWN. I think all those security programmes are a bit of a con.