oh, i didn't understand your previous response.
you could try to delete it and recopy it. however, i don't think that particular file should be on your windows disk. if it is a windows file, then your windows would have asked you to insert the xp cd so that it could install the file from it.
instead, it sounds to me that it is a lexmark file that is either corrupted or in-compatible with your xp.
maybe you should download a current copy of it from their website to ensure it is an up to date dll.
you mentioned speaking with a lexmark tech. so the possibility that your printer is not compatible with your system "or" the possibility that you don't have a driver for xp would have been discussed at the time.
so the above being said, if windows still states it can't find the file in that sub folder, then i don't have any other suggestions.
if it is a new printer, then i would return it for credit due to it being in-compatible with your system.
frankly, xp is a very good o.s. and installing hardware on it should be flawless. so if xp says it can't operate that piece of hardware, then it is highly unlikely the problem is with xp. instead the problem is with the manufacturer of that product.
therefore buy some other printer like from hp or canon.
the problem you might encounter however, is that since xp is an older o.s., there may not be any new printers on the market that can run on it. so ensure you read the side of the printer box and carefully review the printers system requirements.