Now, SURELY you're not still also loading the CD-ROM device driver in CONFIG.SYS (and a redirector like MSCDEX.EXE in AUTOEXEC.BAT), right? It seems like that's not a mistake you would make, from reading your posts in this thread.
Do the hard disk controllers in the Device Manager have the (!) on them? On the "Performance" tab of the System Properties does it say that "Some drives are using MS-DOS compatibility" and "Compatibility-mode paging reduces overall performance"? It's been years since I've dealt with that, so I'm not sure if it deletes the paging file or not.
Or, installing that chipset driver, it can't initialize the driver properly on boot, and is throwing the NOIDE key in the Registry (which I think is in HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\IOS. Seems familiar).
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