virtualbox.org

Hello,
I have a problem with the installation of Win 7. I created a DVD boot of the OS, and when I start the installation from this device all works well. But when I tried to install the OS by means of the ISO file of the same DVD, Vitrual Box tells me there was a Failure Boot because the support is not valid. That sounds me strange since I innstalled Win Xp and Ubuntu by means of iso files.
have you encountered this problem with your VB version?
My guest is a Vista, but I don't think this a problem of guest.
any idea?
thanks in advance

Yes, this has been discussed. VirtualBox expects any disk image file size to be a multiple of 512 bytes (the normal hard disk sector size), and will reject it if it isn't. An ISO image should in fact be a multiple of 2048 bytes (the CD/DVD sector size), but VBox doesn't go that far in its checks. Check the ISO yourself, you may be able to repack it with a tool such as ISOBuster.