Issue while exporting large reports to Excel

I am facing a situation where I am receiving the "Index out of bounds" error while trying to export my reports to excel.

This happens only for big reports which have say more then 10k rows.
However the same reports are easily exported in another m/c, which makes me wonder if it has something to do with the IIS settings.
I am running Windows Server 2003 with IIS 6.0 in my machine.

The difference was SP1 for SQL Server.|||

Would you please email me a copy of your .rdl and .rdl.data file as well as the stack trace from the server log file?

Thanks, Donovan.