I picked up an LK-170 last night. I plugged it into my Windows 7 PC today, and it installed the correct drivers automatically. Check if you have an error in Device Manager if it didn't work on yours. I've just installed "VanBasco's Karoake Player" as per this topic: http://www.casiomusicforums.com/index.php?/topic/5322-can-you-download-songs-to-the-lk-series/?p=12726 and it works great