Excell won't open

[NOTTNICK]

I have produced a series of spreadsheets this morning. (Excel 2003) on
my laptop.
Have been saving them on a shared network folder.
I have come to open them again and all I get is a the excel background
with no worksheet.
They all opened fine earlier this morning.
Every other machine on the network can open the spreadsheets (from
this location) just fine.
I can open other spreadsheets from that same folder that I produced on
other days.
If I copy this morning's spreadsheets to my laptop, they still won't
open.
In all other aspects Excel works fine.
If I save a new worksheet to the location now, it opens fine.
It's just this morning's work on my machine!!

Any ideas?

Nick