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Source: Microsoft Support
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Consider the following scenario:
You start Windows setup by booting using DVD media.
The DVD drive is attached to a storage controller which is supported natively by the drivers supplied with Windows. However, you wish to install third-party drivers for this controller.
During Windows Setup, on the page titled "Where do you want to install Windows?", you choose "Load Driver" to install the third party storage driver. You install a new driver for the storage controller which your DVD drive is attached to.
In this scenario, you may encounter the following error message after starting Windows Setup:
Windows cannot install required files. Make sure all files required for installation are available, and restart the installation.
This behavior may occur when you are installing from DVD media, and you load a new driver for the storage controller that the DVD drive is attached to.
This behavior occurs because after installing the new driver, it is possible that the drive letter for the DVD drive may change. If the drive letter changes, Windows is no longer able to find the disc in order to continue with setup.
To work around this problem, do not install the third party storage driver during Windows Setup. Instead, run Windows setup using the drivers provided with Windows. After Windows Setup completes, you may install the third party storage driver using Device Manager.
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