Hyperlink displays blank page

I recently installed two new pcs running Excel 2003. I have a workbook that
contains hyperlinks to worksheets within the same workbook. The workbook is
saved as a web page (.htm). When I open the htm file and click on the
hyperlink it displays a blank page. There is not an error message.

Other important info:
The problem does not occur on pcs running previous versions of Excel.
The problem does not occur if I save the htm file on my desktop, only when
it is saved to a mapped network drive.
If I open the .xls file, the hyperlinks work.
Hyperlinks to other files (not in the same workbook) work.
The problem occurs when signed on to the network as an administrator with
full rights.