The base IDE drivers in BIOS are not user adjustable; There is nothing you can do 
in there.

Go here and look for the link "Microsoft" to download the Emergency Recovery Utility:
http://www.helpwithwindows.com/windows95/start-27.html
NT systems: http://www.larshederer.homepage.t-online.de/erunt/

This program may initially direct you to the floppy drive, but a disc will not hold 
a complete backup. Re-direct it to a hard disc folder, usually c:\erd. Then, if you 
cannot re-start after modifications, boot to "safe mode command prompt" and run C:\ERD\ERD. 
This will re-set your registry where you started.

Then go ahead and try deleting the entries mentioned at
http://www.helpwithwindows.com/techfiles/msdos-compatibility.html. 
I **think** this can be accomplished by deleting all IDE drivers in the device manager 
and re-booting, esssentially re-installing them.

NOTE: Say a prayer first! I do believe I ended up re-installing windows (several 
times) the one time I have seen this issue on a single partition. If the whole drive 
is affected, it is usually because an optical drive is on the same IDE channel (cable).

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