This can happen if you have the wrong type of printer set as your default printer in Windows (e.g. a label printer, etc.). To fix the issue, close Cashbook, then do the following:-
As of April 2014, Microsoft no longer support Windows XP. As a result, when Windows Updates are applied to some Office apps, it can cause them to fail on XP machines.
Cashbook Complete always remembers the last data file that you were using and will open it by default, the next time you start the software.