"WARNING! Your computer is infected with spyware! Buy [product name] to remove it!"
Usually, when the dialog box's OK button is clicked, this will direct the user to the software's website. Sometimes, even clicking the upper right hand X button to close the dialog box will produce the same effect or activate the software's installation. (Pressing Alt+F4 can circumvent that trick).
A variant of the above technique that rogue security software makers use is that of false positives. A false positive is a fake or false malware detection in a computer scan. This can convince even advanced users that their computer is infected who may not be deceived by the above-mentioned similar claims without a scan. This is quite different from an accidental false positive, which can be produced in a scan by security software from honest companies.
To help protect yourself, we recommend you run you system as a "Standard" user instead of an "Administrator." For more information regarding Windows User Accounts: CLICK HERE.
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Additional user information may be found via the StopSign KNOWLEDGE BASE.