Cannot access SharePoint Site

Server: SBS 2008
IIS Version: 7

We came in this morning to find that we could not access Sharepoint. I checked the event logs and found the following:
Log Name:      Application
Source:        Windows SharePoint Services 3
Date:          3/12/2012 8:48:10 AM
Event ID:      6800
Task Category: Topology
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      SBS08.DCC.local
Description:
The database ShareWebDb on SBS08\Microsoft##SSEE is not accessible to missing Windows Internal Database signatures.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Windows SharePoint Services 3" />
    <EventID Qualifiers="0">6800</EventID>
    <Level>2</Level>
    <Task>807</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2012-03-12T13:48:10.000Z" />
    <EventRecordID>247202</EventRecordID>
    <Channel>Application</Channel>
    <Computer>SBS08.DCC.local</Computer>
    <Security />
  </System>
  <EventData>
    <Data>The database ShareWebDb on SBS08\Microsoft##SSEE is not accessible to missing Windows Internal Database signatures.</Data>
  </EventData>
</Event>

I tried to run the SharePoint Products and Technologies Configuration Wizard and it failed with the following error:
Unhandled exception has occured in your application. If you click Continue, the application will ignore this error and attempt to continue. If yu click Quit, the application will lose immediately.
Operation is not valid due to the current state of the object.
Details:
See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.InvalidOperationException: Operation is not valid due to the current state of the object.
   at Microsoft.SharePoint.Administration.SPContentDatabase.ValidateDatabaseSchemaCompatibility()
   at Microsoft.SharePoint.SPSite.PreinitializeServer(SPRequest request)
   at Microsoft.SharePoint.SPWeb.InitializeSPRequest()
   at Microsoft.SharePoint.SPWeb.EnsureSPRequest()
   at Microsoft.SharePoint.SPWeb.get_Request()
   at Microsoft.SharePoint.SPWeb.InitWeb()
   at Microsoft.SharePoint.SPWeb.get_WebTemplate()
   at Microsoft.SharePoint.SPEvaluatorModeProvisioning.TryGetIsSiteProvisioned(String template, String relativePath, Nullable`1 port, SPSite& provisionedSite, SPWeb& provisionedWeb, Uri& provisionedUri)
   at Microsoft.SharePoint.PostSetupConfiguration.WelcomeForm.ShowNextFormForServerRoleSingleServer()
   at Microsoft.SharePoint.PostSetupConfiguration.WelcomeForm.PsconfigBaseFormNextButtonClickedEventHandler(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Loaded Assemblies **************
mscorlib
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4216 (VistaSP2GDR.050727-4200)
    CodeBase: file:///C:/Windows/Microsoft.NET/Framework64/v2.0.50727/mscorlib.dll
----------------------------------------
psconfigUI
    Assembly Version: 12.0.0.0
    Win32 Version: 12.0.6500.5000
    CodeBase: file:///C:/Program%20Files/Common%20Files/Microsoft%20Shared/Web%20Server%20Extensions/12/BIN/psconfigui.exe
----------------------------------------
System.Windows.Forms
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4214 (VistaSP2GDR.050727-4200)
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4220 (VistaSP2GDR.050727-4200)
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4016 (NetFxQFE.050727-4000)
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
System.Configuration
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4016 (NetFxQFE.050727-4000)
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Configuration/2.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Xml
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4016 (NetFxQFE.050727-4000)
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
Microsoft.SharePoint
    Assembly Version: 12.0.0.0
    Win32 Version: 12.0.6545.5002
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/Microsoft.SharePoint/12.0.0.0__71e9bce111e9429c/Microsoft.SharePoint.dll
----------------------------------------
Microsoft.SharePoint.SetupConfiguration.Intl
    Assembly Version: 12.0.0.0
    Win32 Version: 12.0.6413.1000
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/Microsoft.SharePoint.SetupConfiguration.intl/12.0.0.0__71e9bce111e9429c/Microsoft.SharePoint.SetupConfiguration.intl.dll
----------------------------------------
System.ServiceProcess
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4016 (NetFxQFE.050727-4000)
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.ServiceProcess/2.0.0.0__b03f5f7f11d50a3a/System.ServiceProcess.dll
----------------------------------------
System.Data
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4016 (NetFxQFE.050727-4000)
    CodeBase: file:///C:/Windows/assembly/GAC_64/System.Data/2.0.0.0__b77a5c561934e089/System.Data.dll
----------------------------------------
Microsoft.SharePoint.Security
    Assembly Version: 12.0.0.0
    Win32 Version: 12.0.4518.1016
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/Microsoft.SharePoint.Security/12.0.0.0__71e9bce111e9429c/Microsoft.SharePoint.Security.dll
----------------------------------------
System.Transactions
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4016 (NetFxQFE.050727-4000)
    CodeBase: file:///C:/Windows/assembly/GAC_64/System.Transactions/2.0.0.0__b77a5c561934e089/System.Transactions.dll
----------------------------------------
Microsoft.SharePoint.Search
    Assembly Version: 12.0.0.0
    Win32 Version: 12.0.6545.5000
    CodeBase: file:///C:/Windows/assembly/GAC_64/Microsoft.SharePoint.Search/12.0.0.0__71e9bce111e9429c/Microsoft.SharePoint.Search.dll
----------------------------------------
msvcm80
    Assembly Version: 8.0.50727.6195
    Win32 Version: 8.00.50727.6195
    CodeBase: file:///C:/Windows/WinSxS/amd64_microsoft.vc80.crt_1fc8b3b9a1e18e3b_8.0.50727.6195_none_88e41e092fab0294/msvcm80.dll
----------------------------------------
System.Web
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4223 (VistaSP2GDR.050727-4200)
    CodeBase: file:///C:/Windows/assembly/GAC_64/System.Web/2.0.0.0__b03f5f7f11d50a3a/System.Web.dll
----------------------------------------
System.DirectoryServices
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4016 (NetFxQFE.050727-4000)
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.DirectoryServices/2.0.0.0__b03f5f7f11d50a3a/System.DirectoryServices.dll
----------------------------------------
Microsoft.SharePoint.Library
    Assembly Version: 12.0.0.0
    Win32 Version: 12.0.6517.5000
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/Microsoft.SharePoint.Library/12.0.0.0__71e9bce111e9429c/Microsoft.SharePoint.Library.dll
----------------------------------------
Microsoft.SharePoint.AdministrationOperation
    Assembly Version: 12.0.0.0
    Win32 Version: 12.0.6500.5000
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/Microsoft.SharePoint.AdministrationOperation/12.0.0.0__71e9bce111e9429c/Microsoft.SharePoint.AdministrationOperation.dll
----------------------------------------
System.EnterpriseServices
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4016 (NetFxQFE.050727-4000)
    CodeBase: file:///C:/Windows/assembly/GAC_64/System.EnterpriseServices/2.0.0.0__b03f5f7f11d50a3a/System.EnterpriseServices.dll
----------------------------------------
Microsoft.SharePoint.intl
    Assembly Version: 12.0.0.0
    Win32 Version: 12.0.6500.5000
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/Microsoft.SharePoint.intl/12.0.0.0__71e9bce111e9429c/Microsoft.SharePoint.intl.dll
----------------------------------------

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration>
    <system.windows.forms jitDebugging="true" />
</configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.


Any help would be greatly appreciated.