False security alerts
Many rogue applications now couple false positives with realistic and dramatic looking system security alerts. They may change the desktop background to a dramatic warning, continuously or sporadically redirect web browsers to a page that informs the user that they are infected and need to purchase a program. They may also change the homepage to a security warning, or bombard the user with continuous security alerts from the task bar, often using the yellow triangle with an exclamation point used by Windows to denote a system error. Some even go to the point of changing the screensaver to the BSOD, to make the user think that windows has crashed due to malware.
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