virtualbox.org

hi ,
Impossible d'ouvrir le CD/DVD virtuel C:\Users\dell 5110\Downloads\ubuntu-12.04.2-desktop-i386.iso.

Could not get the storage format of the medium 'C:\Users\dell 5110\Downloads\ubuntu-12.04.2-desktop-i386.iso' (VERR_NOT_SUPPORTED).

Code d'erreur : VBOX_E_IPRT_ERROR (0x80BB0005)
Composant : Medium
Interface : IMedium {29989373-b111-4654-8493-2e1176cba890}
Fonction appelée : IVirtualBox {3b2f08eb-b810-4715-bee0-bb06b9880ad2}
Code retourné : VBOX_E_OBJECT_NOT_FOUND (0x80BB0001)
I don't know what's the probleme

Seems like your ISO is corrupted. You should download it again and do a checksum on it.