After changing my username on my laptop I can no longer log in (with new or old username). How can I fix this?

My laptop won't accept my username (or the old username) since I changed it (I wanted to shorten it). I originally thought it was the password so went through the process of reinstalling the system with the original disk (with apple support help over the phone), but that wasn't the problem. How do I get the computer to recognize my username? Thanks!

Yeah, you can't do that so easily...
Return to default desktop, apparent "loss" of home directory, (it can happen spontaneously too)...
http://docs.info.apple.com/article.html?artnum=107854
But you have worse problems now, might see if this works, but first...
Does it boot to Single User Mode, CMD+s keys at bootup, if so try...
/sbin/fsck -fy
Repeat until it shows no errors fixed.
(Space between fsck AND -fy important).
Resolve startup issues and perform disk maintenance with Disk Utility and fsck...
http://docs.info.apple.com/article.html?artnum=106214
Do not continue if it fails to repair the disk.
Reset OS X Password Without an OS X CD...
http://theappleblog.com/2008/06/22/reset-os-x-password-without-an-os-x-cd/
Admin Hack...
http://www.hackmac.org/?q=node/4
Starts up like the first time you buy a new Mac, but after filling in all that info again, you should have access to the computer and the other Users & files will still be there... give the new User a different name than an existing one.

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