Do you have a CF-IDE adapter or do you have the Via MII with the built-in CF reader? You can't boot off the MII's CF reader (at least not into XP/XPe). Bootprep is included with the XPe Tools. What CF card do you have? Have you tried to at least boot into DOS? Just use a boot disk and then format the CF disk using "format n: /s" where n is the letter of the CF card.