Thanks. The server is running the live version of my site, so I will try this at the weekend or very early one morning. Will let you know how I get on.
I realize this is an old post but I'm encountering the same issue. The link reference suggests running ASP.Net 1.1 or 2.0 in 32 bit. But my question is NOP 1.9 is running on 4.0. So... Does this still apply and if so would I switch the site to run ASP.Net 2.0 in 32 bit?
Above fix does not work for me, i make the changes and then the application pool crashed when i try to click on export to excel. Then the complete website stops working and stalls at a