Well, if you know what misake was made and you simply need to get in so that you can undo the mistake, one of the most pain free process would be to see if a friend can burn a copy of Knoppix for you. This will give you a CD-rom bootable linux enviorment where you can mount your hard drive and make the changes that you desire, then reboot without the disk to see if the changes had the desired effect.
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