This may be recorded along with event id 33002. If this is the case, see the comment below:
"I had the same problem after installing KB934525. After doing some searching I found an important note that was not on the main page of the patch but in the description details an another page. You have to do one more step after you run the patch to complete the installation:
After you apply this hotfix package, you must run the SharePoint Products and Technologies Configuration Wizard.
To do this, click Start, point to All Programs, point to Administrative Tools, and then click SharePoint Products and Technologies Configuration Wizard.
Important Because of a problem with the hotfix installation, you must not run the SharePoint Products and Technologies Configuration Wizard to complete the installation if you are running a Windows SharePoint Services stand-alone installation that uses the Windows Internal Database Engine. Instead, you must use the Psconfig.exe command-line utility. To do this, follow these steps:
1. Click Start, click Run, type cmd in the Open box, and then click OK.
2. Change to the following directory:
system drive\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\Bin
3. Run the following command:
psconfig -cmd upgrade -inplace b2b
If you ran the SharePoint Products and Technologies Configuration Wizard, you may experience a long delay, and the wizard may not be completed successfully.
Alternatively, the configuration process may be unsuccessful, and you may receive the following error messages:
An exception of type System.Data.SQLClient.SQLException was thrown. Additional exception information access to module dbo.proc_MSS_GetConfigurationProperty is blocked because the signature is not valid.
Additionally, the following event may be logged in the Application log:
Event ID: 5586
Source: Windows SharePoint Services 3
Unknown SQL Exception 33002 occured.
Additional error information from SQL Server is included below.
Access to module dbo.proc_MSS_GetConfigurationProperty is blocked because the signature is not valid.
If you experience these issues, use the Psconfig.exe command to manually complete the installation of the hotfix."
Check to make sure that the SQL service accounts are setup properly and that the right password is provided for the services themselves. This error will occur if SQL is not running.
- Error information: "An error has occurred while establishing a connection to the server" - Make sure that the SQL services are running.
Run the following command at the command line:
C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\BIN\psconfig -cmd upgrade -force
This will allow you to uninstall SharePoint. Re-install SharePoint but when applying the TR patch stop the search service and delete the search registry keys as if you were perofming an upgrade of an existing site.