Save open work and back up important files. Use instructions for your exact device and software version. If Windows cannot start, see the startup guide.
Work through these checks
0 of 3 complete01Boot from Windows Defender Offline scan USB
- Boot from Windows Defender Offline scan USB
Check whether the original symptom still occurs.
If it does not helpContinue only if this check applies to your device. Consult its manufacturer if you are unsure.
02Rebuild BCD and MBR from Windows recovery
- Rebuild BCD and MBR from Windows recovery
Check whether the original symptom still occurs.
If it does not helpContinue only if this check applies to your device. Consult its manufacturer if you are unsure.
03Consider full system wipe — rootkits are rarely fully removable
- Consider full system wipe — rootkits are rarely fully removable
Check whether the original symptom still occurs.
If it does not helpContinue only if this check applies to your device. Consult its manufacturer if you are unsure.
Possible causes
- Malicious software with kernel driver
- Bootkit infection from compromised boot media
- Exploitation of signed driver vulnerabilities
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