SQL2005 SP 3

Hello,

I have a windows 2003 server with SQL 2005 installed. When I try to update to sp3 I get the following:

Event Type:      Error
Event Source:      MsiInstaller
Event Category:      None
Event ID:      10005
Date:            4/1/2009
Time:            9:37:04 PM
User:            WNA-INV\administrator
Computer:      WNA-NTSERVER2
Description:
Product: Microsoft SQL Server 2005 Express Edition -- Error 29528. The setup has encountered an unexpected error while Setting Internal Properties. The error is: Fatal error during installation.


For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 7b 32 41 46 46 46 44 44   {2AFFFDD
0008: 37 2d 45 44 38 35 2d 34   7-ED85-4
0010: 41 39 30 2d 38 43 35 32   A90-8C52
0018: 2d 35 44 41 39 45 42 44   -5DA9EBD
0020: 43 39 42 38 46 7d         C9B8F}  

Can anyone help?