Hi,
Again, the problem is that AC has been installed as a server ("main computer") on what was a client computer.
That's what the error messages that you posted are saying.
It wasn't successfully installed as a server, so it won't work.
It has no SQL running to function as a server and probably lacks other files mentioned in other error messages.
It isn't trying to connect to the real server on the network. It's trying to connect to a failed server installation on itself.
You can try the windows restore, and then completely remove the failed server install with Revo uninstaller.
Otherwise, you have to delete all the AC and SQL folders and delete all the AC registry entries with regedit.
Then you can install AC as a client, not a server, and connect to the real server.
Cheers,
Carl Fogel