WinDVD Catastrophic failure

Hi, I hope somebody can help me.

When I try to install windvd using the switch setup.exe -s, an error occurs that reads something like "Catastrophic failure - Error extracting support files". This did not happen before, only recently. The only things I've changed are I used nLite and for runonceex.cmd, I changed it to run from Cdrom. I know nLite is not the problem because when I installed a clean version in VPC, the same problem still pops up.

My switch for windvd. This worked when I was running runonceex from C:\.

REG ADD %KEY%\120 /VE /D "WinDVD" /f
REG ADD %KEY%\120 /V 1 /D "%cdrom%\install\WinDVD\setup.exe -s -f2c:\logs\windvd.log" /f
REG ADD %KEY%\120 /V 2 /D "%cdrom%\install\WinDVD\3rdPartyApp\InterActual\install.exe" /f
REG ADD %KEY%\120 /V 3 /D "regsvr32 \"C:\Program Files\Intervideo\DVD6\IAManager.dll\" /s" /f 
REG ADD %KEY%\120 /V 4 /D "REGEDIT /S %cdrom%\install\WinDVD\windvd.reg" /f
REG ADD %KEY%\120 /V 5 /D "pskill msiexec.exe" /f

One time after I've installed XP, I went in to try to manually install winDVD, and ended up succedding, but I've no idea what I did. I changed registry permissions, I changed Temp drive permissions and other weird things, but i've no idea which caused it to work in the end. Can somebody give me advice?

Thanks a lot in advance