How to run windows 7 set up through my external dvd reader?

I have problem as you, I searched on google on few days and I find out a successful method. I share it for you and hope it will be useful to you. Good luck!

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Hi. First you should have a boot able DVD. Then put it into external DVD player then after switching your laptop press some buttons like f2 or f12 if it doesn't appear anything restart your lap and press both fn and f2 or f12. If you see boot sequence get CD ROM to the first item. Then restart your lap. After coming a dash flashing press any button on your keyboard to get the DVD installing.

One option is to get "Windows 7 USB DVD Download Tool" which is free and from Microsoft I'm not going to link it here because by downloading it from the MS site you'll know it's legit. It can copy any Win 7 install disk onto a USB stick and make it bootable - which is so much easier.
Beyond that, I've heard that some BIOS don't get along well with the boot loader that's on the Win 7 install DVD, so you'd have to use another boot manager to start it up. I like to use PLoP (which will also give you the option to boot from USB, even on systems that don't have a built in way to boot from USB). I'll provide a link in my sources, download 5.0.14 and inside the ZIP will be an ISO you can burn to make a boot CD.

You can both install and run windows 7 from any external hard drive, however the trick is to make sure you leave the external hard drive on always or turn it on before turning on your pc… If the drive is left off and you start your pc you will receive a "no bootable media" message as windows can't be found
to install windows 7 you need to
1) ensure the external drive is powered on and
2) run the windows 7 dvd media and when you reach the install stage select the external hard drives "drive letter" and choose this as the installation drive
3) once finished it will always use this drive as the windows boot drive
in regards to the boot loader well this will also be installed to the external hard drive so again this is why you should always have your ex drive powered on and ready to go

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