The standard things to try with problems like this you have probably already done:
-check filter drivers
-check transfer mode for optical drives for nasty Mr. PIO
-turn off DVDFab’s read ahead cache
-lock DVDFab in SPTI access mode (and try ASPI if that doesn’t work)
-uninstall the optical drive and reboot to let windows reload the drivers
-remove possible software conflicts: InCD, AnyDVD etc. anything that grabs the drive access layer and doesn’t let go
If you are getting the IFO message, DVDFab is at least partially reading the disc. If you have an old version of DVDFab, upgrade to either 220.127.116.11 or the 18.104.22.168 beta. Sever 2003 is not specifically listed as a supported OS, but I think others use it OK. You also might try disabling PathPlayer. Tell us how you make out.