Edit: I updated the description to make some parts more clear.
ReactOS fails to boot the livecd because it cannot detect the CD Drive. I'm seeing IopCreateArcNames fail with c0000034 (STATUS_OBJECT_NAME_NOT_FOUND).
If I replace uniata with the atapi driver in the iso, it does detect the CD Drive and boot normally, so there appears to be a problem with uniata.
The computer is a Compaq Deskpro EN Series SFF, and the drive is a COMPAQ CD-224E. See more information about the computer in the attached files called CIRYON.
reactos-0.4.4-livecd.log - Debug log from an unmodified ReactOS 0.4.4 LiveCD
reactos-0.4.4-livecd-uniatadebug.log - uniata.sys replaced with the debug version of the latest (0.46e2) uniata driver
CIRYON.log - Specs of the computer in text format
CIRYON.HTM - Specs of the computer in a nicer to read html format
PICT0015s.jpg - A picture of the actual CD Drive
If you want any further information, just ask. I'm also available on IRC (Harteex).