Loox's pocket PC?

When amending/adding information to my mileage record page in Excel a message appears "An error ocured saving mileage "
even if I create a copy same happens but re-writing and adding to contents it saves. To add information I have to write a new file every time I want to add my weeks mileage and that's a pain in the arse.
I should point out its just an excel page not a mileage record program.

Many thanks in anticipation.