Quick update: last night I installed Windows 7 on the MacBook. It was all fairly smooth, but just took a long time by the time I had downloaded the drivers etc from Apple and then installed the Windows updates. There was no problem using the OEM copy of Windows (it was brand new, and sealed... I wouldn't like to have done it with an opened and possibly pre-registered copy).

Tonight I will install MConfig and see how that goes!

John
Main: G61R SL, HD621, DSP5200 SE L&R, DSP3300 C, DSP3200 Surr, Roon, MS200 & 218, Oppo BDP-103, Humax HDR, vMSR running on iPad mini 6 (iOS 26.3)
Second: M6 mono, 210, Distributor 1, Project TT, MS200 (for IR)
Third: F80