I'm trying to downgrade a Toshiba C55-A5300 laptop from Windows 8.1 to Windows 7. I have the install instructions from Microsoft on the process, downloaded a Windows 7 iso image from DigitalRiver, and have made a Windows 8 recovery set in case I ever want to go back to it. I also solved the BIOS issues to get the cd to boot, but now the installation process insists on CD/DVD drivers, and will not continue without them (quite logically). But, I can't seem to find any - not even at Toshiba. CD/DVD is a Matshita DVD-RAM UJ8C2. Anybody got an answer on how to get this downgrade to work?