the network service account is the account that the application pool is running under, so you can change it there to a domain account that has sufficent permissions to run asp.net on the web server and also store your files - see http://msdn.microsoft.com/en-us/library/ms998297.aspx for details.

Cathal

I'm sorry I didn't quite understand your response.

If you mean that you're getting a permissions error on c:\windows\temp, that would indicate that you haven't granted the necessary permissions to that folder. Any asp.net function that uses serialization uses c:\windows\temp (or more accurately %TEMP%) as a location for creating temporary assemblies, so your asp.net user needs "modify" permissions for this folder

Cathal