DVD rom - "... is not accessible. Access is denied"

Hi,

I have a serious problem with my DVD-rom drives. Everytime when I start/restart Windows everything seems to be fine, but after a few minutes (random) I get “X:\ is not accessible. Access is denied.” error on all my drives. It happens even during recording DVDs…

WinXP MCE SP2 EN

Installed programs:

-DVD Decrypter
-Nero Burning ROM v7
-DVD Identifier
-Cyberlink PowerDVD
-D-Tools v4 (earlier v3.x- same problem)
-Alcohol 120% v1.9.5 b3105

Drive is locked by some program.

Right-click on your ROM drive and on Recording tab check [B]enable CD recording on this drive[/B].