I would start by blacklisting dell-wmi
Code:
$ sudo modinfo dell-wmi
filename: /lib/modules/2.6.32-5-686/kernel/drivers/platform/x86/dell-wmi.ko
alias: wmi:9DBB5994-A997-11DA-B012-B622A1EF5492
license: GPL
description: Dell laptop WMI hotkeys driver
author: Matthew Garrett <mjg@redhat.com>
depends: wmi
vermagic: 2.6.32-5-686 SMP mod_unload modversions 686
And since your system can't boot past this so as to edit the proper file, use a live cd.