I have used Windows 7 64 bit for several months. Initially my Canon Pixma MP810 bluetooth printer functioned perfectly with this OS. About a month ago my Canon suddenly stopped responding, showing 'Offline' status. When troubleshooting , I found the following message: Windows has stopped this device because it has reported problems. (Code 43). I have ininstalled and reinstalled the printer several times, but it will only work for a few days, and then the same problem appears. Can someone help with this? Thank you.