This may help..........
Delete all the xbe's in the game folders except the "default.xbe" on
the HDD and see if they work.
The games are trying to update your dash files or download new
content.
Update the M$ Dash yourself and try playing them through the M$ dash, and
then try the Evox Dash.
(One other shot in the dark, did you try a different IDE cable as well as another
rom reader power wire for the hell of it.)
eye_share