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#51
Did you try writing to flash stick with the program I linked?
If it let you download updates from the net during install then it wasn't booted. Try install booting the DVD, then the flash stick if necessary: How to Boot your Computer from a Bootable CD or DVD
You can also use the Dell F12 one-time BIOS boot menu key to trigger DVD or flash stick (under USB, Removable or HD's). Try setting HD first to boot in BIOS setup, then using F12 to boot the disk or USB.