Optical drive comes and goes; Is registry setting OK

vbimport

#1

Sony VAIO GXR600 win2k sp 4 w/ Toshiba DVDROM SD-R6012

Some days my internal dvdrom/cdrw drive is present and usable and some days it’s missing from explorer. Yesterday I accessed a data cd in the morning, but when I went to burn a cd later, the drive had disappeared from explorer and device manager and wasn’t recognized by nero 6. I plugged in my external LG ReWriter and it appeared in explorer and was recognized by nero 6. But I got another coaster to add to the collection.

The following is from the nero log once it started logging times.
6:59:46 PM #2 Phase 90 File dlgbrnst.cpp, Line 1818
Buffer Underrun Protection activated
6:59:46 PM #3 Text 0 File Reader.cpp, Line 118
Reader running
6:59:46 PM #4 ISO9660GEN -11 File geniso.cpp, Line 3814
First writeable address = 0 (0x00000000)
7:00:00 PM #5 Text 0 File Burncd.cpp, Line 3081
Turn on Disc-at-once, using CD-R/RW media
7:15:20 PM #6 Phase 40 File dlgbrnst.cpp, Line 1818
Aborted by user
7:15:20 PM #7 Text 0 File DlgWaitCD.cpp, Line 229
Write in overburning mode: FALSE
7:15:20 PM #8 Text 0 File DlgWaitCD.cpp, Line 1688
Recorder: HL-DT-ST DVDRRW GSA-2164D;
CD type reading failed ATIP Data: ?

and
Registry Keys:
HKLM\Software\Microsoft\Windows NT\CurrentVersion\WinLogon\AllocateCDROMs : 0 (Security Option)

Is that registry setting OK? Should I delete or change it?

I did play some sound files w/ Windows Media Player between the time the internal drive worked and disappeared. I have WMP 9. It gave me a blue screen when I first installed it and I noted it installed roxio drivers. Is there an alternative to WMP?