Not official drivers for now, the latest available ones are for Windows XP. please <a href="http://downloads.lexmark.com/perl/downloads/downloads.cgi">check here</a>
Most printers are compatible with drivers for other models from a given manufacturer. In the case of the Lexmark Optra E310, the safest choice of driver that Microsoft ships with Windows Vista or Windows 7 is "Lexmark Optra E" (a slightly older model in the same series.) You may need to click the "Windows Update" button in the select driver window to download the "expanded" set of Windows printer drivers if you haven't done so in the past.