Both these updates keep failing to install, anyone have any ideas?

Security Update for Windows Server 2003 and Windows Server 2008 (KB948109)
Event reported at 15/07/2008 6:03 PM:
Installation Failure: Windows failed to install the following update with
error 0x80070643: Security Update for Windows Server 2003 and Windows Server
2008 (KB948109).


Security Update for Windows Server 2003 (KB948110)
Event reported at 15/07/2008 8:44 PM:
Installation Failure: Windows failed to install the following update with
error 0x80070643: Security Update for Windows Server 2003 (KB948110).