Four
Four (4) startup disks are needed to boot Windows 2000 from floppy disks.
4
It is a set of four rescue disks.
4 "four" rescue disks.
100
they are floppy disks
There is no such thing. Windows can only read floppy disks that are in good condition and have a file system it supports, namely FAT12 or FAT16.
Floppy disks.
Most floppy disks will come pre-formatted. All floppy disks need to be formatted to be usable.
Yes. Most floppy disks all the way from the original IBM PC to the present day use the FAT file system, so a floppy created in Windows 95 (or MS-DOS, for that matter) could still be read on Windows XP or Windows Vista.
No reason why not. Windows XP should be able to read disks created with Windows 98 without any problems. OpenOffice is capable of reading a wide variety of files.
The disks may have become damaged, thus making them unreadable. It is also possible that one or both of the floppy drives involved had misaligned heads. The drive the wrote the files to the disk may have placed them incorrectly, and thus only that drive can read those disks now. Or the drive on the Windows XP computer may be misaligned, and can't read the disks created correctly.