After one of those days whan I had been sitting at the computer for too many hours, I was on the Site-Settings module intending to make a skin change, and due to over-tired blurry eyes clicked on "Delete" instead of update.  This was  portal/1 (the only portal) on my local system.  I tried to manually re-enter the record, but since I do not fully understand the relationship between all the tables, have been unable to get the site working again. I am getting a message which seems that my lnk to the portal alias table is at the root of the problem:  Any help would be appreciated.

[NullReferenceException: Object reference not set to an instance of an object.]
   DotNetNuke.Entities.Portals.PortalSettings.GetPortalSettings(Int32 TabId, PortalAliasInfo objPortalAliasInfo) +114
   DotNetNuke.Entities.Portals.PortalSettings..ctor(Int32 tabId, PortalAliasInfo objPortalAliasInfo) +93
   DotNetNuke.HttpModules.UrlRewriteModule.OnBeginRequest(Object s, EventArgs e) +3717
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication+IExecutionStep.Execute() +60
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +87

So does anyone know how to fix this?  Unfortuneatly, I had to do a full re-install.