Missing Firmware for Wired NIC on Debian

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http://unix.stackexchange.com – I'm trying to install debian 64bit from a debian live image using YUMI on my usb drive. I'm installing it on an Inspiron 6400, and there is missing firmware. I can't connect to the internet whatsoever, and am at a loss. I've tried configuring it myself to no avail. I downloaded the drivers, transferred them to the laptop, and it wouldn't run the install file because none of the networking directories seemed to exist. Does anybody have experience with this, or could anybody nudge me in the right direction? Thanks. (HowTos)