Be sure to backup your boot.ini file while your at it.

If you already mucked it up, here is the contents of it:

"[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINNT
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINNT="Microsoft Windows XP Professional"

Just save that as boot.ini and copy it over the existing one. Then try and do it all over again. :-p

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When i changed my boot screens i used booteditor. ThemeXP has the link to it on their site:

http://www.belchfire.net/~userxp/indexbe.htm