software that scares people into installing and buying more software that makes their system more fucked up than it really is.
Criminals are using scareware to try and infiltrate the victims computers now that they have security software installed
Scareware: Using popular and mis-spelled search terms, the criminals divert people to sites that are seeded with fake warnings about virus infections. The pop-up warnings claim that a visitor's PC is riddled with malicious programs, virusses and spyware. In turn visitors are duped into buying fake removal software.
Scareware peddlers are misleading people with false evidence that their machine is infected with viruses and are encouraging them to download and buy software that basically does nothing.