oldfish

Hi, My Windows2000 can not recognize my Samsung 16X DVD ROM which comes with my DELL PIII system? I had it working properly before, but after i install/unistall several creative sound card driver or webcam drivers, the system can not recognize my CDROM( No letter) and i can not add new hardware... But i can boot directly from CDROM driver. Anyone have similar experience and how can i solve the problem? Many thanks.

Hi, I desperately reinstalled the whole system. Now everything is working. Just when i installing the Intel IDE Ultra driver when i realized my problem: i removed one ATA100 device driver one day. (when i see there is two ATA100 device so i just stupidly delete one) That actually killed my 2nd IDE interface. I think that is the reason that the system can not locate DVD drive. So the solution could be reinstall ATA driver and get the CDROM back. It seems a pretty reasonable reason for me. But anyway i reinstalled the whole system. It's running great now and thanks agian for your kind help.

Thanks again for your help! But it seems reinstall of APCI layer is not helpful. I did installed a UDF CD reader downloaded from website, I tried to clear the key mentioned in the articel but seems not work things out. I am trying to recover cdrom.sys but i do not know how i can get the file since the CD can not recognized by the system. again i can not see CD listed in Device Manager. I can reinstall the system, but i would like to understand the real reason that causing this incase i am running into this again. Got any more hints? Thanks!

Checked here: [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contr ol\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}] "UpperFilters"= Cdralw2k "LowerFilters"= CDr4_2k C) After a right click on My Computer, Manage, Storage, Removable Storage, Physical Locations, do DVD-ROM appear? my drives appear in Physical Locations under removable storage, but they have a red "X" on the left side of them. But there isnt a mention of what type of problem there. But i do not know how to make an expand. My W2k CD start up automatically installation and can not allow me to expand CDsys file. Could you give me more hint? I have tried to remove CDr4_2k from the registry key value and rename file CDr4_2k.sys to CDr4_2k.sy_ but still not solve the problem.

Hi, wolf: Thanks for your hint. But the problem is: i can not even locate my CDROM drive in device manager. There is nowhere showing hardware conflict. It seems the system can not find DVD at all. But i can see it listed in BIOS configration. I also able to use the CDROM if i booted in DOS mode. Thanks for your attention!!