Does anyone have any idea how to get the agent installed on 2008 R2 Core? I keep getting the error message below - its driving me insane.

I've installed all the available hotfixes and the agent works correctly on another normal 2008 R2 installation.

10-23-2009,20:20:53 : Property(S): MsiTrueAdminUser = 1
10-23-2009,20:20:53 : Property(S): TRANSFORMS = |C:\Symantec\RAWSX64\1033.MST
10-23-2009,20:20:53 : Property(S): AdminUser = 1
10-23-2009,20:20:53 : Property(S): MsiAMD64 = 15
10-23-2009,20:20:53 : Property(S): VirtualMemory = 7547
10-23-2009,20:20:53 : Property(S): MSPSRCDFABEBD163354070A82F358CD4659A29 = C:\Windows\Installer\28cce.msp
10-23-2009,20:20:53 : Property(S): WindowsVolume = C:\
10-23-2009,20:20:53 : Property(S): VersionNT64 = 601
10-23-2009,20:20:53 : Property(S): TRANSFORMSATSOURCE = 1
10-23-2009,20:20:53 : Property(S): ProductState = -1
10-23-2009,20:20:53 : Property(S): OutOfDiskSpace = 0
10-23-2009,20:20:53 : Property(S): OutOfNoRbDiskSpace = 0
10-23-2009,20:20:53 : Property(S): PrimaryVolumeSpaceAvailable = 0
10-23-2009,20:20:53 : Property(S): PrimaryVolumeSpaceRequired = 0
10-23-2009,20:20:53 : Property(S): PrimaryVolumeSpaceRemaining = 0
10-23-2009,20:20:53 : Property(S): ARPINSTALLLOCATION = C:\Program Files\Symantec\Backup Exec\RAWS\
10-23-2009,20:20:53 : Property(S): RegIdCounter = 33
10-23-2009,20:20:53 : Property(S): MajorVersion = 12
10-23-2009,20:20:53 : Property(S): MinorVersion = 5
10-23-2009,20:20:53 : Property(S): BuildMajor = 2213
10-23-2009,20:20:53 : Property(S): BuildMinor = 0
10-23-2009,20:20:53 : Property(S): SOURCEDIR = C:\Symantec\RAWSX64\
10-23-2009,20:20:53 : Property(S): SourcedirProduct = {C5D4270D-457F-4DD9-B4D7-2B20940780D2}
10-23-2009,20:20:53 : === Logging stopped: 10/23/2009 20:20:53 ===
10-23-2009,20:20:53 : A fatal error occurred during installation on server 'SERVERNAME'.
10-23-2009,20:20:53 : ERROR: Installation failed with error 1603.