When I upload a sketch, it will “almost” always stop with the green progress bar at about 10% progress. This is not board specific. In looking at the events log in the USB properties I see this change that I believe corresponds to this problem starting:
Driver Management has concluded the process to add Service usbser for Device Instance ID USB\VID_2341&PID_0042\857343232303510130D0 with the following status: 0.
Driver Management concluded the process to install driver usbser.inf_amd64_a465ab02edb9afb0 for Device Instance ID USB\VID_2341&PID_0042\857343232303510130D0 with the following status: 0x0.
The device instance described in this case is for my Mega2560. I tried updating the serial driver, but got a response that it is up to date.
I can occasionally get a sketch to load by a combination of shutting down the IDE, disconnecting the USB and/or holding the reset button while uploading.