De acordo com esta postagem no Fórum de Ajuda do Google :
For Windows XP, go to:
C:\Documents and Settings\Administrator\Local Settings\Application Data\Google\Chrome\User Data\Default.For Vista, go to:
C:\Users\Administrator\Local Settings\Application Data\Google\Chrome\User Data\Default.You can see a file named
Bookmarks.bak. Maybe you can make a backup copy of this folder for safety purposes, but it works out usually. Delete the fileBookmarksand rename the fileBookmarks.baktoBookmarks.