The first thing to do is find the key in the Registry. On my machine, it's
at HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Word\List Gallery
Presets; in your case, it will probably be 10.0 instead of 11.0. I'm not
sure exactly where to go from there, but I would suggest exporting the key
(which backs it up), then deleting it. This seems to be the advice given in
"WD2000: Invalid Page Fault in Mso9.dll When You Use Bullets and Numbering"
at
http://support.microsoft.com/?kbid=281520; for a less detailed version of
this article for Office XP, see "You receive a 'Microsoft Word has
encountered a problem and needs to close' error message when you try to
create a bulleted list or a numbered list in Word 2002" at
http://support.microsoft.com/?kbid=904806
"problems with using bullets in WORD"