Help!!! Have upgraded from Excel 2003 to Excel 2013 and now me "ExcelExpert" worksheet/program thingy don't work?!!!!

Hi

Excelexpert kindly created a workbook/sheet/program (using Excel 2003) for us to log, inventory and track movement of our archiving for our clients.
We have just upgraded our PCs to newer versions and they came with Office 2013 already installed.

Now our beloved archiving program throws up:

The following features cannot be saved in macro-free workbooks:
VB Project
To save a file with these features, click NO, and then choose a macro-enabled file type in the file type list.
To continue saving as a macro-free workbook, click yes.

I click NO and get an error which states:

Run-time error '1004'
VB projects and XLM sheets cannot be saved in a macro-free workbook

Any suggestions????

Thanks in advance

Mat