Can't install windows 7 because the installation can't find drivers for the cd/dvd drive

I have been struggling for an entire day trying to downgrade a windows 8.1 pc to windows 7 pro.  I have tried to install from a dvd and also from a usb drive.  One suggestion was that the installation media was corrupt.  I have redouwloaded the iso 5 times and created an installation usb drive 3 times and three times with a dvd drive.  I keep getting the same message after clicking on Instll windows.  It tells me it can't find the drivers for the dvd or usb drive
dlennonAsked:
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☠ MASQ ☠Commented:
It would help to know what hardware you're downgrading.
Have you already switched from UEFI to Legacy BIOS?
Is your hard drive formatted so that Windows 7 can recognise it? (If not look at using DISKPART as described here: http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Windows/Windows_7/Q_28500887.html)
As far as your USB install goes don't forget that the Windows 7 installer doesn't natively support USB 3.0 ports.

If the HDD is formatted correctly you could try either checking for a legacy USB 2.0 port on your computer (this is why knowing about your hardware will help) or try adding USB 3.0 drivers
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Rodney BarnhardtServer AdministratorCommented:
While it may be much more complicated, you could try to create an installation pack that included the drivers for these two devices. Download the Win 7 drivers from the manufacturer, then follow the steps outlined in the link below:

http://superuser.com/questions/63773/how-to-add-drivers-to-windows-7-installation-dvd
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adez12Commented:
Are you still able to boot into the Windows 8.1 OS?  What model computer are you working on?

If you are able to still log into Windows 8.1, and are running hardware acceleration, please be sure to disable hardware acceleration first, and then try re-installing Windows 7.
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joinaunionCommented:
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nobusCommented:
please give some more info :
for USB install : is the usb stick connected directly to the back usb ports (for a desktop)? if not try that
for DVD install : is that from an INTERNAL drive, or usb drive (see also above)
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dlennonAuthor Commented:
I figured it out by googling the question.  It turns out there were usb settings in the BIOS that had to be changed.  I mad several changes but I think the key change was changing an auto setting that allowed a usb port to be both usb2.0 & 3.0.  When I changed it to 2.0, it seemed to work
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☠ MASQ ☠Commented:
Great, you should be good to go from here on - and can switch those settings back once the drivers are running in 7.  As I said it's really important to know what hardware you are installing to as there are all kinds of "gotchas" like this, particularly the lack of USB 3.0 drivers in Windows 7 installer (it used to be the same with SATA drivers in XP!) & without that part of the jigsaw we're just throwing you out ideas in the hope that one will work for you.

Thanks for letting us know.
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nobusCommented:
nice to hear you solved it.
i pointed  in the right way it seems
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dlennonAuthor Commented:
There were several problems I had to get past.
1)  Had to figure out how to boot to the bios in a windows 8.1 pc
2) I had to disable secure boot
3) I had to just use the 2.0 USB in the BIOS
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