Question about Office Equipment & Supplies
If you have a new computer there is an excellent chance that it came with Vista.
If you are trying to install the drivers using the disk that originally came with your printer, it will not have the drivers for Vista on it, to get the correct drivers go to the location:
where is says "search by printer model" type in T640 and the select your operating system.
If it still complains about the signature just ignore it and tell it to proceed, it probably just means that Lexmark never submitted the driver to Microsoft for testing and certification (Microsoft charges for that).
Posted on Oct 07, 2008
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Posted on Jan 02, 2017
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