Is there not a Win Me specfic inf for your monitor? (although in theory it shouldn't need a specfic one) I looked in the win98se inf for Nokia and there is no mention of a 446Xs, just about everything else 446 though.
Try Nokia's site for a inf download and change the monitor in the display props pointing it to your new inf file.
I had this at first with a Mitsubishi Diamond Pro 720 and even the Mitsubishi Inf didn't help because there wasn't a specfic file for the 720.
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