Hi and thank you for your question.
Please inform your friend NOT to call up that number; it's shown by a scam/rogue third party, and NOT affiliated with Microsoft in any way. These types of "services" hijack the browser and show up these fake popups/alerts to trick users into providing them with their personal/financial info, along with allowing them remote access to their PCs. Microsoft will never provide unsolicited contact info unless their services are specifically requested for. They may simply restart their computer/browser to get rid of that popup/alert now.
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