By default IIS 7 only allows the uploading of up to 30MB files.
To increase this do the following:
Open IIS 7 SnapIn
Select the website you want enable to accept large file uploads.
In the main window double click ‘Request filtering’
once the window is opened you may see on top a list of tabs eg: file name extensions, rules, hidden segments and so on…
regardless the tab you select, in the main window rightclick and select “Edit Feature Settings” and modify the “Maximum allowed content length (bytes)”
Now you can upload files larger than 30 MB