I earlier posted a request on this forum and particular subject in October last year, it appears there is a firmware upgrade that rectifies the problem of the SN not being recognized when using windows 7 64 bit machines. My question is I have since downloaded the most recent driver software dated 29th November 2011. I have a desktop PC that is running windows 7 64 bit Enterprise and the SN works fine in both the 3d mouse trainer and in Google sketch up 8. However after reinstalling the new driver software dated as above, on 2 x identical laptops that are running windows 7 64 bit home edition, the SN still is not recognized, I have tried all suggestions that Barbara a moderator from 3D connexion has suggested as possible work arounds to no avail. I'd love to know more about the firmware upgrade!