Well… perhaps I spoke too soon.
I finished installing Win10 and installed the Steinberg drivers. It went fine on the first go- even using the newest Texas Instruments drivers for the FW card.
Shut down and restart. Still fine.
Installed Cubase.
Shut down and restart. Still fine.
Installed Google Chrome and Waves Control Center, Waves plugins, transferred licences.
Shut down and restart. Still fine.
Went to bed.
Got up this morning, woke up my computer.
Yamaha FW Driver failed to initialize.
Device manager:
Steinberg FW Bus - this device is working properly; Driver Details = ksthunk.sys and yfwbus.sys (just like last night)
Steinberg MR816 Series - No drivers are installed for this device (strangely, it said that on the other working system too); driver details = ksthunk.sys
View > show hidden devices
Steinbertg FW WDM Audio - Currently, this hardware device is not connected to the computer (Code 45). To fix this problem, reconnect this hardware device to the computer. - Driver Details = dmk.sys; ksthunk.sys; portcls.sys; yfwaudio.sys
The only thing that changed from when it worked last night to when it failed to initialize this morning was that the computer went to sleep and I woke it up. (some windows updates were installed too, apparently)
Chris