Save open work and back up important files. Note any recent driver or hardware changes. If Windows cannot start, use the startup guide first.
Work through these checks
0 of 3 complete01Boot from Windows Defender Offline scan USB
Boot from Windows Defender Offline scan USB.
Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.
02Rebuild BCD and MBR from Windows recovery
Rebuild BCD and MBR from Windows recovery.
Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.
03Consider full system wipe — rootkits are rarely fully removable
Consider full system wipe — rootkits are rarely fully removable.
Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.
Possible causes
- Malicious software with kernel driver
- Bootkit infection from compromised boot media
- Exploitation of signed driver vulnerabilities
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