The remaining system showing the USB problem is the Dell Latitude XT.
A google search does turn up references to others reporting that this hardware has problems with USB devices plugged in at boot time (presumably on Windows): http://www.gottabemobile.com/forum/forum_posts.asp?TID=6595&PID=45284&SID=3a2zz67cfbfdf45b73b86987ab1d5c1e#45284
Though that could be entirely unrelated.
The remaining system showing the USB problem is the Dell Latitude XT.
A google search does turn up references to others reporting that this hardware has problems with USB devices plugged in at boot time (presumably on Windows): www.gottabemobi le.com/ forum/forum_ posts.asp? TID=6595& PID=45284& SID=3a2zz67cfbf df45b73b86987ab 1d5c1e# 45284
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Though that could be entirely unrelated.