Start here
Do not call the number in the pop-up, install unfamiliar tools or provide payment information.
What to look for
Close the browser using the normal application controls or task manager; do not click buttons inside a suspicious warning.
Protect your information
Check whether notifications were permitted from an unknown website and review recent browser extensions.
When to seek help
If you gave someone access or shared a password, disconnect and request help securing accounts and evaluating the computer.
This guide is general information, not a substitute for diagnosis of a specific device or network.
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