Cannot burn DVDs, X64, Ultimate, device not recognised

My new Vista Ultimate system does not seem to recognize my DVD as a
burner. I can read data DVDs, play movies etc. It is a Lite-On LH-20A1S
SATA burner.

The system was built by me from a legal OEM Vista disk.
Processor is AMD X2 64 bit processor.
The only 'foreign' DVD software installed is RealPlayer V10.5. (ie no
Nero etc)
In Windows Media Player under 'Burn' it says 'Connect a burner and
restart'.
Windows DVD maker has no devices in the 'DVD burner:' dropdown.
I have de-installed and re-installed the device.
If I upgrade the drivers Vista says they are up-to-date.
In Device Manager (and the BIOS) the devices are correctly recognized
The Vista-installed driver is cd-rom.sys.
No drivers came with the device nor are they available on the liteon
website.
I do have other devices on my IDE channels, but I boot from SATA.

Any idea how to get Vista to recognise there is a burner there?


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