Windows 7 RC 6.1.7100 64-bit
Intel Desktop Board DP965LT (ICH8 Southbridge) in AHCI Mode
Plextor PX755SA (PX775A, SATA version), detected as "PLEXTOR DVDR PX-755A ATA Device".
Motherboard BIOS has been flashed to the latest version.
Optical drive firmware has been flashed to the latest version.
Windows explorer burns files fine.
CDBurnerXP 22.214.171.1240 does not detect any compatible burners (of course).
Running it in XP Compatibility Mode (XP SP3) or Vista Compatibility Mode (Vista SP2) with "Run as Administrator" turned on doesn't help.
Granting full permissions for every group