Hi everbody I've trying to install it for 2 months but i couldn't make it, isaw every errors:) at the end of i saw this error

DotNetNuke Configuration Error

Object reference not set to an instance of an object.

DotNetNuke has extensive file upload capabilities for content, modules, and skins. These features require custom security settings so that the application is able to create and remove files in your website.

Using Windows Explorer, browse to the root folder of the website ( C:\DotNetNuke by default ). Right-click the folder and select Sharing and Security from the popup menu ( please note that if you are using Windows XP you may need to Enable Simple File Sharing before these options are displayed ). Select the Security tab. Add the appropriate User Account and set the Permissions.

If using Windows 2000 - IIS5
- the {Server}\ASPNET User Account must have Read, Write, and Change Control of the virtual root of your website

If using Windows 2003 - IIS6
- the NT AUTHORITY\NETWORK SERVICE User Account must have Read, Write, and Change Control of the virtual root of your website

I made all of thing i couldn't understant,CAN ANYBODY HELP ME?

I did all  instructions but i couldn't install it,i cant understand why this error  was shown because i made all of setting about sharing and security permission.
I think it should be from sql server's collation setting but i cant set the setting.
Thanx for your relation

I found my problem; it turns out I was not using a local ASPNET account. The other one must've been made manually and called a similar name, which showed up first when I searched for ASPNET in the security dialog.

After that, DNN installed in 2-3 minutes and ran immediately!

I used FILEMON to find out which application user was trying to access the problem file

http://www.sysinternals.com/Utilities/Filemon.html

Hope this helps

chris