A virus could be a sort of malware that, once dead, replicates by inserting copies
of itself (possibly modified) into different laptop
programs, data files, or the boot sector of the exhausting drive; once this replication succeeds,
the affected parts are then "infected". In addition, when a file gets automatically downloaded on your PC without permission, never access it; as
it's a threat for your PC. The best way, I've found, to tackle a virus spyware removal in Windows,
is to first:1 - Boot into Safe Mode with Networking.