Ex****t to spreadsheet error, help please

I am trying to Ex****t to a spreadsheet using the following code, but I keep

getting  error

"Run-Time error '2302' Can't save the output data to the file you've 
selected."

This is my code:

DoCmd.OutputTo acOutputQuery, "propertyrequest", acFormatXLS, 
"C\datastream\ex****t_data\Property" & "_" & UsrName & ".xls"

I am assuming its the file format? I am using Access 2007, in a 2002 -
2003 
format and using Excel 2007 set to save in Excel 97 - 2003 format.

I am running Vista Ultimate.

Any help would be most welcome.