Bootable x64 and x86 ISO for Windows 10 build 1809 (October 2018 Update) and earlier. Microsoft’s Diagnostic and Recovery Toolkit (DaRT) 10 lets you diagnose and repair a computer that won’t start or has problems starting as expected. With DaRT 10, you can restore end-user computers that have become unusable, diagnose potential causes of problems, and quickly troubleshoot unbootable or frozen computers. If necessary, you can also quickly recover important lost files and detect and remove malware even when your computer is offline