Scam computer lock out with instructions to call Microsoft.

Calling the number and briefly speaking—or later answering a spam call—does not by itself compromise your Windows 11 PC or phone; if you shared nothing, installed nothing, entered no commands, and allowed no remote access, the main consequence is that scammers know your number is active and may call again.

The lockout message was a tech-support scam. Genuine Microsoft error messages do not include a telephone number, and Microsoft does not proactively contact users to fix an unsolicited computer problem.^1^

What to do now

1. Block the scam numbers on your phone and do not answer further calls from them. Caller ID can be falsified, so also ignore similar calls from different numbers.
2. Do not restore the scam browser tab when reopening your browser. If the page returns, press Ctrl+Shift+Esc, select the browser in Task Manager, and choose End task.^2^
3. For reassurance, run a Windows Security scan:
   • Open Start and search for Windows Security.
   • Select Virus & threat protection.
   • Select Quick scan.
   • If anything suspicious happened during the call, select Scan options → Full scan → Scan now instead.^3^
4. Report the incident through Microsoft’s technical-support scam reporting option.^1^

Take additional action only if one of these occurred

• You gave them a password, verification code, banking/card details, or other sensitive information:
  Run the full malware scan first, then change the affected passwords from a trusted device. Contact the bank or card issuer immediately for payment information. Microsoft’s compromised-account procedure specifies scanning before changing the Microsoft account password.^4^
• You downloaded an app, typed commands, or permitted screen sharing/remote control:
  Disconnect the PC from Wi-Fi or unplug Ethernet. Remote-assistance tools can let another person see or control the computer, so access should be granted only to someone trusted after you initiated support directly.^5^
• They remotely accessed the PC and changed settings—or you cannot determine what they changed:
  Keep the PC offline, back up only personal documents/photos to external storage, and perform a Windows factory reset/reinstallation. Uninstalling the remote-access program or receiving a clean scan result may not undo unknown configuration changes. This is the stronger remediation recommended for a matching case involving unauthorized remote access and changed settings.^6^
• You installed something but did not grant control:
  After backing up important files, run Windows Security → Virus & threat protection → Scan options → Microsoft Defender Offline scan. The PC will restart and scan outside normal Windows.^7^

The determining questions are whether you installed software, typed commands, shared a password or verification code, provided payment information, or approved screen sharing/remote control. If none occurred, there is no indication from the events described that either device was compromised.

References

1. Avoid and report Microsoft technical support scams | Microsoft Support
2. Unwanted pop up security alert claiming to be Microsoft - Microsoft Q&A
3. Stay protected with the Windows Security app | Microsoft Support
4. How to recover a hacked or compromised Microsoft account | Microsoft Support
5. Solve PC problems remotely using Quick Assist | Microsoft Support
6. Hacker, Microsoft Defender & settings - Microsoft Q&A
7. Three easy steps to improve your cybersecurity | Microsoft Support