The Windows Unlocker tool disinfects the following:

• Registry of all operating systems installed on the computer (in separate partitions or in separate folders of the same partition)
• User registry branches

To learn how to boot under Kaspersky Rescue Disk 2018, see the guide in this article.

To learn how to run Windows Unlocker, see the guide in this article.

After Windows Unlocker completes its work, run a full scan in Kaspersky Rescue Disk 2018.

To learn how to run a scan in Kaspersky Rescue Disk 2018, see the guide in this article.

Some malware deletes Windows system files. If the files were deleted, your computer cannot function correctly even if malware has been disinfected.  

How to restore the corrupted system files:

1. Run the Windows installer on a disk or USB drive.
2. In the autorun menu, select Repair your computer. 
3. Follow the instructions of the wizard to restore files.

To view the log of Windows Unlocker actions, click Report in the Kaspersky Rescue Disk window.

When the work of Windows Unlocker is complete, restart the computer. Go to BIOS settings and select your hard drive on the Boot tab.

You can ask your questions on Windows Unlocker and Kaspersky Rescue Disk 2018 at Kaspersky Lab forum.