Please use at least 4GB usb drive to create the Windows 10 Preview installer.
Before we create the bootable, we need to install Windows USB/DVD Download Tool, you can free download from this link.
After that install the Windows USB/DVD Download Tool.
You will find the Windows 7 USB DVD Download Tool shortcut on your Desktop. Use it to start this tool.
A UAC Prompt will be shown. Click or tap Yes.
You will be asked to select the ".iso" file containing the Windows installation files. Click or tapBrowse.
Browse your computer, select the ".iso" file and click or tap Open.
After choosing the file, click or tap Next.
You are asked to choose the type of media that you want to create. You will need an empty USB memory stick or a blank DVD to move forward. Plug in the type of media that you want to use and then select it in the Windows USB/DVD Download Tool.
After selecting the media type, select the drive where the selected media type is found and click or tap Begin copying.
If that drive is not empty, you are asked to erase it (this works only for USB memory sticks). Click or tap "Erase USB device" to continue.
You are informed that the tool will erase all contents from the selected device. Click or tapYes to confirm the operation.
The Windows installation files are now being copied to the selected drive. Wait for the process to finish as it will take a while.
When done, you are informed that the bootable device was created successfully. Close the Windows USB/DVD Download Tool and eject the drive from your computer.
