The User Account module doesn't appear in the add module drop down menu. I have clicked on "Import Module Definition", selected "Desktopmodules/UsersOnline/Settings.ascx" from the Control drop down and selected Import Control. I received the error message "Error Importing Selected Control."  I have been able to import other modules but not the user account module. How do I reinstall the User Account module?

I downloaded the Install manual from Resources/Documents but it didn't describe how to "reinstall" DNN. Do I FTP the contents of DotNetNuke_04.08.04_Install.zip to my DNN directory and over write the existing files on my web site? I read "Upgrading v3.x to v4.x Install only" on page 38 of the "DotNetNuke Installation Guide.pdf" but I couldn't figure out the second step which says "In VS2005 or VWD select New Website … and follow the procedure described in the previous chapter, except that you will need to select the location of your existing Website;". 

I also downloaded "DotNetNuke_04.08.04_StarterKit.vsi" but couldn't open it since I don't have a vsi archive program to open it. I Google'd vsi archive but couldn't a program to open the file.

I'm going nowhere fast!