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Windows 7: Toshiba Satellite S855, trying to install Windows 7

19 Jun 2013   #41

Desk1 7 Home Prem / Desk2 10 Pro / Main lap Asus ROG 10 Pro 2 laptop Toshiba 7 Pro Asus P2520 7 & 10

Quote   Quote: Originally Posted by DarK EnergY View Post
ok so I have the same laptop as cam and am trying to put widows 7 ultimate 64 bit on it but when I try to install the os it says "a required cd/dvd drive device driver is missing..." im installing it from a flash drive, and its been a pain getting it this far, and now im stumped. switched boot mode from uefi to csm to get this far. any ideas? thanks in advance!
Hum whatever drive you put or have in should be picked up by the BIOS if I am not mistaken and the install should "look" at what you have on board.

My System SpecsSystem Spec
19 Jun 2013   #42
DarK EnergY

windows 8 64bit

i looked it up more and someone said it shouldn't be the drivers, that the disc is probably corrupt. im making another bootable disc, this time using windows 64 bit home premium. hopefully it will work

edit: it made no difference. any ideas?

edit again: so turns out it was just the iso I was trying to use. even though I tried 3 different ones, but all from the same location. once I switched to a completely different download from a torrent site, I had no issues. installing on my other pc as I type this...hopefully im not jinxing it right now lol
My System SpecsSystem Spec
19 Jun 2013   #43
Microsoft MVP


How are you activating Win7 on that Win8 machine?

If you have a license use the latest official installer for your licensed version from Clean Reinstall - Factory OEM Windows 7.

If you don't have a Win7 license, you'll need to buy one.
My System SpecsSystem Spec

24 Feb 2014   #44


Buenos días, aquí les dejo los drivers necesarios para instalar en toshiba satellite c855-S5133 luego de hacer el downgrade a windows 7 64b. Estan comprobados, he subido los que yo mismo he usado para una reciente instalacion.
(tienen adfly y linkbucks asi vale la pena compartir )

1) Boot unit and press F2 to get into BIOS

2) Go to "Security" tab and disable "Safe Boot"

3) Go to "Advanced" tab, select "System Configuration" then change boot mode from "UEFI" to "CSM"

4) Press F10 to save changes and exit.

My System SpecsSystem Spec
29 Oct 2016   #45

Windows 7 Ultimate x64
Thanks for posting this.

Quote   Quote: Originally Posted by theog View Post
Downgrade Windows 8 to Windows 7

You need to do all of the step 3 first.

Quote   Quote: Originally Posted by theog
3) Reset BIOS to default, and reboot to BIOS make sure Secure Boot is disabled.
Make sure CSM is ENABLED, & set to UEFI boot.
NOTE: Check your manufacturer's uEFI BIOS manual for settings.
Take a look at this post.
UEFI Bootable USB Flash Drive - Create in Windows - Page 7

Found this on Toshiba Support site.

How to enable CSM for a Toshiba.(Satellite Pro C870, Satellite Pro L830, Satellite Pro C850, Satellite Pro R950, Portege R930, Portege Z930)

Quote   Quote: Originally Posted by Toshiba
To downgrade from a installed Windows 8 OS to a Windows 7 OS, using a Windows 7 recovery media, follow these steps:

1) Boot unit and press F2 to get into BIOS

2) Go to "Security" tab and disable "Safe Boot"

3) Go to "Advanced" tab, select "System Configuration" then change boot mode from "UEFI" to "CSM"

4) Press F10 to save changes and exit.

5) Boot unit from recovery media (Press F12 on bootup to boot from USB or DVD media)

Steps to Install Windows 7 on a Windows 8 Unit
Necessary changes in the UEFI Firmware (BIOS) for a successful downgrade from Windows 8 to Windows 7

Toshiba How-To: Resetting your UEFI Bios Firmware on Windows 8 - YouTube
How To: Enter the system BIOS or UEFI in Windows 8 - Toshiba Forums

How to make Toshiba Recovery disks.

Toshiba How-To: Understanding Windows 8 system recovery options - YouTube
Toshiba How-To: Create System Recovery Media on a USB Flash Drive - YouTube

Toshiba Satellite Pro C640/C650 with Windows 8, make recove ery disc, page 68
Steps 1 thru 5 helped me successfully downgrade to Winndows 7 Enterprise on a Toshiba S855- S5378 with a new SSD.
My System SpecsSystem Spec

 Toshiba Satellite S855, trying to install Windows 7

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