The scary thing is that depending on how your computer is configured, it can also occur as a result of something that happens from an external source (such as a hacker). This isn't "common" per say, but its not unheard of. Other ways that it can occur is depending on your internet connection, if you use an internet connection that requires a login authentication system (such as PPP or PPPoE), if your ISP has been affected in the right way with a virus, the update script that gets run after the hardware handshake and the credentials have been verified can actually give you a virus. That type of case however is rare, and I've only ever personally witnessed it once by an ISP that soon thereafter went belly up.
In either case listed above, the most common thing that it will produce is what I like to call a pornato. A pornato is defined as the sudden continuous pop up of windows of porn sites. These sites typically range anywhere from fake porn listings with pictures to fool you (sometimes banner ads) to sites like "My Jizz Diaries". The only reason I know that site and know that it is a source for getting a pornato was when my 8 year old cousin accidentally opened the wrong email, had it pop up, and asked me "What is this?"….. Talk about ACKWARD! :lolp:
