does the computer datalog everything else or is there no communication at all? First thing that popped into my head was a driver issue. Maybe trying reinstalling the driver and/or livelink.
are you using XP or vista?
2010 Ford Escape 3.0 V6
2004 F350 6.8L V10
1986 XR4Ti 2.3L Turbo
2007 ST ; formally bewst'd - R.I.P