A web page claiming that your computer is infected is not, by itself, evidence of an infection. Treat unexpected demands to call a number, install software, or pay for help with caution.
Do not interact with the warning
Do not call a number in the pop-up, install its suggested tool, or give someone remote access. Close the tab or browser using the browser’s own controls. If necessary, close the browser through your operating system’s application controls; unsaved work in that browser may be lost.
Reopen carefully
Avoid restoring the suspicious tab. If notifications keep returning, review website notification permissions in the browser’s settings and revoke permissions for sites you do not recognize.
Use your own security tools
Open the security software already installed on your device directly, rather than following the warning’s link. Update it and run a scan if you downloaded or opened something suspicious.
If you gave someone access
Disconnect the affected device from the network to end ongoing remote access. Use another trusted device to secure important accounts, and seek qualified help to inspect the affected device. Contact your financial institution promptly if payment information or money was involved.
Further reading: FTC: How to spot, avoid, and report tech support scams.
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