Now have boot disks but boot sequence still aborts
As you suggested I made use of a friend's PC to create the 4 Win2k Boot disks.
I attached the external discette drive to the Sony Vaio, put in disk 1 and pressed the power switch.
When the progress bar on the Windows 200 Professional screen was about two thirds complete the blue screen appeared with the stop message 0x7B, "INACCESSIBLE_BOOT_DEVICE as in the original problem .
During the STARTUP the discetTe was spinning, so assume it was being used but perhaps not as a substitute for the hard disk C:.
Switched off and restarted, held down F8.
Selected Safe mode but same result.
Seems the Sony is not recoverable by the boot-discette route, perhaps because of errors on the C: drive.
Thanks for all your help.