I installed my 5200c scanner (USB) several times. Each time after install it works fine for several scans until I power down or reboot. After I reboot and try to either scan or test the scanner I get the following message: "Sorry, cannot access your scanner. Your scanner is currently being accessed by another application. Please wait for the other application to finish or close it to allow this application access." There are no other applications open. There seems to be no problems in device manager. I have also downloaded the HP patch sj435en.exe and installed it. None of this worked so far. I have run USB diagnostics and the USB checks out fine. What do you recommend?