IOS Image

I have bootable usb  for win8.1 , I need to convert it to bootable ISO  and install operating system from image  . I am able to create ISO image but boot failed  ,  can you send me require steps to create bootable win8.1 ISO image .
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
The original "media supplied" by Microsoft is either a DVD-ROM or an ISO which is bootable. This is used to create the USB Image you have.

Use the original DVDROM or ISO you have.
salmaaloufAuthor Commented:
I don't have Operating System on DVD or ISO I have  it only on USB flash drive . I want to convert it to ISO bootable image to be able to install  operating system  on new VM , I used Ultra ISO software but when I create VM and start installing operating system through ISO I created , its missing bootable files .
my question : how can I convert operating system on USB to Bootable ISO to install on VM .
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
here is a step by step guide, you can follow, to create an Bootable ISO from the USB files you have

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salmaaloufAuthor Commented:
Thank you for your advice . I am able to create bootable image .
salmaaloufAuthor Commented:
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