Alright I figured it out I think.
C:\PROGRA~1\ImgBurn\ImgBurn.exe /MODE Build /SRC "C:\Documents and Settings\Joyce\Desktop\disc1.ibb" /START /ROOTFOLDER Yes /NOIMAGEDETAILS /closesuccess
It was that not having /NOIMAGEDETAILS that gave me that message. After including that in my command it is now burning with no intervention from me. I will let you know if doesn't work.
Thanks,
uByte