Windows 7 x64 - only drivers I could get to work for Tripp Lite Keyspan USB to Serial Device. Current Link to adapter page - http://www.tripplite.com/en/products...xtModelID=3914 (click on support tab and download driver for windows 7 x64 (beta driver)) or direct driver link - http://www.tripplite.com/shared/soft...ndows%207).zip