Derek,
Thanks for getting back to me. Your solution worked as I got the Server Manager site up and working again. However, I am running into the same issues that made me uninstall and re-install the software in the first place.
The issue is that I am not being allowed to publish any GIS resources from either ArcMap or ArcCatalog. ArcMap fails to make a connection to the server, and ArcCatalog has the ability to publish services grayed-out (see attached pictures). This is so even though I am accessing ArcServer through the admin option. To make matters worse, when I try to publish a service definition file on ArcServer I get a blank box when I am asked what capabilities I would like to enable, which in turn makes the publishing fail (see attached picture). The account being used to access the server is the arcgis account created when ArcServer was installed. The arcgis account is a member of agsadmin, administrators, remote desktop users, and users. So it shouldn't be a permissions problem, but based on the errors I feel that it still is. Any advice? Thanks.