I have an excel (2000) workbook which automatically pulls in data from
lots of different sources using SQL, web queries, and links to other
workbooks.

This has been working fine unit today when all of a sudden it crashes
withough warning giving the following error message

The instruction at "0x3006dac2" referenced memory at "0x00000000". The
memory could not be "read".

Does anybody know what this means or how to fix it??

Thanks in advance.

Alan