Problems to Create Bootable Media - 'Acronis Loader': Keine Konfigurationsdatei gefunden.

I wanted to create a rescue boot CD with Acronis Home 2012 (build 7133) and burned the ATIH2012_de-DE.iso file to a CD.

I did this on several WIN7 PC's (with a Roxio utility) and I always get the error message

'Keine Konfigurationsdatei gefunden.' (no configruation file found)

from the Acronis loader when trying to boot from the CD.

I was more successful doing exactly the same, ie. burnig the same ISO file on a WinXP SP3 PC (using a Nero utility) and guess what: The rescue CD works fine on all PCs!

Any ideas what the problem may be? Is it win Win7 (64-bit) or the burning utitlity or something else?

Thanks for your advice Reto