Fresh install of Windows 10 on Acer Aspire V5 122-P needs DVD driver

I have an external DVD player plugged in via USB to my Acer Aspire V5 122-P which Acer says is supported for Windows 10. The disk a valid Windows 10 Professional disk created from an ISO download direct from Microsoft.

With BIOS set to Legacy mode I have booted from the Windows 10 installation DVD and before long it asks for a disk to be inserted with a CD/DVD driver on it to continue.

I have not been able to find something it will accept as a CD/DVD driver.

Acer support downloads have nothing.

The following are not accepted:

http://www.driverguide.com/driver/company/Acer/index.html

http://drivers.softpedia.com/get/MOTHERBOARD/AMD/Acer-Aspire-TC-220-AMD-SATA-Driver-130010276-for-Windows-10-64-bit.shtml#download

The existing internal hard disk as a Windows 10 installation on it that was the result of an upgrade from Windows 8. I need to do a fresh install and overwrite this, any drivers under windows/system32 I have found are also not accepted - at least when I select them from the hard drive that is about to be overwritten.