missing cd rom and cdrw

my cd rom and cdrw have disappeared from my device manager,no cds will work,i have a yellow exclamation mark next to primary and secondary disk controllers,i have tried to update drivers and it says i am already using best ones,i have not changed anything on my system lately to cause them to dissapear.any help im not very technical and dont know a lot about the technical side of computers.
dowfooAsked:
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MindphaserConnect With a Mentor Commented:
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WiZaRdCommented:
Go to start-run & type regedit then click OK.
go to edit-find & type noide & click on find next button
delete any noide entries found (continue by pressing F3 button until you get message saying finished)
reboot & see how you go
still no good go to dos prompt & type fdisk /mbr (note the space after fdisk) then press enter.
Exit dos & reboot
still no good go to start-run & type msconfig & click OK
uncheck config.sys & autoexec.bat, apply, restart as prompted & see how you go
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Crash2100Commented:
another thing you can try is to restart in safe mode and remove EVERYTING under cd-roms and drive controllers.  Then restart in normal mode and let windows reinstall the drivers.

What brand and model is your motherboard/computer?
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Kyle SchroederEndpoint EngineerCommented:
If removing the IDE controllers from Safe Mode doesn't work (which it might not under Win95...are you using Win98 or ME or 95 or what?), you can boot to Safe Mode, go to the Registry at:

HKEY_LOCAL_MACHINE\ENUM and delete the ESDI key.  This will remove all information on IDE controllers directly from the registry.  If you have a "PCI IDE" key, check that to see if it is showing your controller, and delete it as well.  These keys will be rebuild automagically after you restart.

-dog*
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wokboyCommented:
If you are using win9x, check out the performance tab of the system properties dialog box. This is where it shows you how much memory you are utilising and also has a section at the bottom which normally states your system is configured for optimal performance. Sometimes however it says something else. Vaguely I remeber the words compatibility mode paging effect overall system performance. If this is what you are seeing then in the past I have seen the following.

If you reboot the machine you might notice a a bios error saying "Invalid Configuration Data" enter the CMOS setup got to teh advanced menu and set Reset Configuration Data To YES then save changes and exit. And hopefully all comes good.

I have also seen it caused by a boot sector virus cleared by running fdisk /mbr on the hard drive.

And certainly it could be a driver issue as mentioned before. Just thought I'd add in some things I have seen
 
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