Rogue antispyware software silently installs spyware(2)

Many rogue antispyware software present outright false positives as a means to alarm computer users into buying. Others among the group have false positives due to bugs in the software's code, not because of an outright lie. Code corrections can move a suspected rogue off of detection lists.
Many rogue applications use deceptive or high-pressure sales tactics to convince users into buying a license. Users will be told that they need to buy protection even if there is nothing dangerous found. Free scans are offered but a license is needed before any dangers can be removed. Free, fully functional trial periods are usually not offered.
Rogue antispyware software silently installs spyware and then offers to remove the spyware. Trojans and toolbars are other sources prompting for rouges to be installed.