Can I use it on a PC whose Windows does not start up?

Yes, you can use it.

The DiskDeleter series is designed so that the OS contained in DiskDeleter is started before the Windows OS starts up, so it can be used even on a PC that has stopped running or a system that has been broken as a system. (Not possible if physically broken)

Because the DiskDeleter series starts up by deploying programs on the system memory, even if there is no OS such as Windows in the PC to be deleted, or it is broken and does not start up, it is possible to erase data by USB boot .