How can I boot windows 7 from a DVD?

Alright so I got a windows 7 iso from Microsoft, and I burned it to a DVD, and now I need help booting it. I am using a slim-type drive, if that's any help. I tried configuring the BIOS to load from the DVD but it just does what it does regularly. I am doing this because I somehow deleted a .dll file that was created to load windows, and so now windows does not start.

All help is appreciated, and thank you all in advance.
 
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