I have ArcGIS server 10.4 installed on a Windows Server 2012 R2 machine. When I try to access the server manager I get the following message. "This machine does not currently participate in an ArcGIS Server site. You can either create a new site or join an existing site."

If I try to join an existing site, it says invalid name or password. The thing is, I'm pretty sure I know what the admin account credentials are. If I try resetting the password using the password reset tool on the server, it gives me "Error: Site has not been created or is not ready. Please try again later"
Even if I try to create a new site, I get an error stating "Failed to create the site. The configuration store location contains server configuration files that being used by another site"
I'm at a loss as to what to try next barring scrapping everything and starting from scratch. Is there anything else that I can try that I've missed?