Have a look here please under ‘Notes for IIS users’ How do I upload files bigger than 2MB / How can I increase the upload file size limit?
or directly here http://ajaxuploader.com/large-file-upload-iis-asp-net.htm
I hope that will help you 
Have a look here please under ‘Notes for IIS users’ How do I upload files bigger than 2MB / How can I increase the upload file size limit?
or directly here http://ajaxuploader.com/large-file-upload-iis-asp-net.htm
I hope that will help you