Problem 1, try copying the floppy first and use the copied disk. Use a windows 98 computer if possible. The old DOS command diskcopy is useful/ Diskcopy A: A:
Or try just dragging the files from the floppy to a new location, and then copying these files to a new floppy. Again a Windows 98 computer might be better.
Windows ZX can be fussy about its Floppy's.
Problem 2 - sorry no ideas.
PS Write protect the floppy's for safety !