Tech support pop-up warnings occur when a user is browsing the Internet. Usually, the target is viewing a website that contains links to related content, and when the user clicks on one of those links it will redirect them to a website hosting the pop-ups. These pop-ups can be terribly intrusive, making it difficult for the user to close the window. The pop-ups will then display a message stating that the computer is infected with malware and offer a phone number for help with removing the malware. Often, these pop-ups will look like they come from a legitimate source.
Examine the message closely- look for obvious signs of fraud such as poor spelling, unprofessional imagery, and bad grammar.