For those folks out there using Windows Server 2003 SP1 Build 1277 along with the SQL Server 2005 December CTP, you may be unable to install SQL Server 2005 with the following error:
Microsoft SQL Server 2005 Beta 3 Setup
The SQL Server System Configuration Checker cannot be executed due to WMI configuration on the machine SI4P64LF3-05 Error:2147749907 (0x80041013).
The cause of this error is a corrupt install of WMI, caused by upgrading Windows Server 2003 to SP1 build 1277. To fix this issue, copy the following into notepad and save it with either a .cmd or .bat extension. Then run the script to re-install WMI:
Regsvr32 /s wbemupgd.dll
Regsvr32 /s wbemsvc.dll
If that doesn't work, try the info here posted on msdn: