Q: Why I can't enter in windows with several SATA DVD-RW? (AN-M2, AN-M2HD, AN52D, AN52V)
A:

This problem results from the NVIDIA chipset compatible issue. Please try to set the SATA as AHCI mode in BIOS. Sometimes the SATA DVD-RW could be used under AHCI mode.(The AN52V doesn’t support AHCI mode)

Notice: if you adjust IDE mode to AHCI mode, you must re-install OS with a AHCI floppy disk. During the installation process, please press F6 to load the driver disk.