OK, guys, I'm guessing that you are using GoDaddy? GoDaddy with the new Plesk hosting does not intall using dbo, when it had always done that before in all of the previous hosting environments using their native installer. I had to blow up that installation and install dnn from scratch myself. Good news, I was able to install it directly in the httpdocs folder with dbo as database.
I actually found this post on the GoDaddy site, which was helpful. (Scroll down at the link. I copied it here.
https://www.godaddy.com/community/Man... )
Re: Installing DNN (formerly DotNetNuke) on GoDaddy Hosting
I was running into some of the same issues you guys were. I was able to get DNN 8.0.3 installed in a virtual directory following these steps:
Create an SQL DB.
Create a virtual directory. In Plesk select Virtual Directories. Make sure you are in the site root and click Create Virtual Directory. Leave all the default settings and click OK to create the application and directory.
Plesk will browse you into your newly created folder. Click Directory Access Permissions. Click on Application pool group (IWPG_{your plesk user name}). Select Allow Full Control check box (all others will check themselves). Click OK.
On your local PC, unzip DNN 8.x install files into a directory and using your favorite editor edit the web.config file. Change the SiteSqlServer setting under connectionStrings to your SQL DB connection string.
Upload all DNN files to the new virtual directory (NO NOT BROWSE TO THE SITE YET!).
Go back to Plesk and make sure you’re still in the virtual directory you created and click “ASP.NET Settings”. Make sure the SiteSqlServer connection string is what you entered (this tells you that you’ve uploaded the web.config correctly and now Plesk can make it’s edits to the correct web.config file).
On the “ASP.NET Settings” change the “CAS trust level” to “Full” and click OK.
Browse to the site. The DNN installation screen should appear. Fill in all the information for the host, site and database, then click Install. Let the application install and you’re done!
And I combined it with this video... It actually did install.
https://www.youtube.com/watch?v=chOgn...If you don't install it with dbo, you are going to have tons of problems with any add ons.