Open link and download driver .....
http://support.lexmark.com/index?locale=en&segment=SUPPORTproductCode%3D&startover=y&userlocale=EN_US&question=Lexmark_X4550&productCode=LEXMARK_X4550&page=answers&detectedProductFacet=CMS-CATEGORY_REF.LEXMARK.PRODUCTS.ALLINONE.LEXMARK_X4550&searchid=1255948371824#2
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