Hi xzibit12,
The error you've attached above is coming from Solr, saying that it can't connect to Alfresco. Similarly, the 404 you're getting and the fact that Share won't log in is because they can't find Alfresco either. So when you booted up the application, something (an error) stopped the alfresco web app from starting correctly.
The best thing to do is shut Alfresco down, backup and remove your logs (optional - but useful to see only the infromation that's relevant to the error) and start the server again. Follow through the alfresco.log as the system is starting up and look for the first main error that stops the application running (it'll say something like "Context Initialization Failed" just after it, which means that tomcat has abandoned trying to start the web app (although the other webapps like Share and Solr will still continue to be loaded)
Regards
Steven