download and run Malwarebytes... make sure you install the FREE version
uncheck Start Free Trial
Malwarebytes ONLY runs when you ask it to (therefore does NOT run and fight any other installed AV program as accumack correctly says) and will find viruses others miss ... Malwarebytes is MY 1st goto program to fix hundreds of infected computers over the years.
IF you find a virus indication from Malwarebytes, which I suspect you might, then do what it says to do AND reboot and run it again
, until it finds NO signs. You can then run it weekly when you go to bed AFTER manually doing a data update.