scan your entire system for viruseS WITH CLAMTK AND A BOOTABLE UBUNTU USB DRIVE
ClamTK®is an open-source antivirus engine for detecting trojans, viruses, malware & other malicious threats. Most Viruses reside in the Windows Boot Sectors and so a Bootable Ubuntu Drive with persistent storage should be created and then you install ClamTK on it and you can scan the Windows Hard Drives and System Files.
A 16gb or larger USB stick is recommended.
Download the Ubuntu ISO file from here:
Next use Rufus: https://rufus.ie/en/ to create the bootable drive with Persistent Storage enabled. Reboot your computer holding down “shift” key and choose the newly created Ubuntu thumbdrive. Once into Ubuntu you need to install ClamAV and then CLAM TK.
Thanks to: https://www.youtube.com/watch?v=RA9NvwtU8j4 for this fix:
sudo add-apt-repository multiverse
sudo systemctl stop clamav-freshclam
sudo systemctl start clamav-freshclam
sudo apt-get install clamtk