MS SQL Server access denied

[vaultnet]

I was initially having troubles with plesk adding domain names to microsoft dns, so I decided to upgrade plesk to the new 8.4 and install the BIND dns server. After restarting the system, I'm now not able to pull up the control panel due to the following error:

ERROR: PleskMainDBException
<b>Source:</b> Microsoft OLE DB Provider for SQL Server<br/><b>Description:</b> [DBNETLIB][ConnectionOpen (Connect()).]SQL Server does not exist or access denied.

0: C:\Program Files (x86)\SWsoft\Plesk\admin\plib\common_func.php3:594
db_mssql_connection()
1: C:\Program Files (x86)\SWsoft\Plesk\admin\plib\common_func.php3:623
reconnect()
2: C:\Program Files (x86)\SWsoft\Plesk\admin\plib\common_func.php3:584
db_connect()
3: C:\Program Files (x86)\SWsoft\Plesk\admin\auto_prepend\auth.php3:79

The service MMC shows the SQL Server as Started. Any would be greatly appreciated.