You can use Windows Explorer to do it. Go to "C:\inetpub\wwwroot\<chart website path>\Xceed Temp", right click on it, select "Properties", click on the "Security" Tab.
Select the ASPNET user and modify its permissions, if it is present (in Vista, you need to click "Edit" to access this window), or click "Add" if not present. Then click "Advanced", followed by "Find Now", select the ASPNET user, click "OK" twice, and you should be set.
André
Software Developer and Tech Support
Xceed Software Inc.