Cannot see phone under 'My Computer' My Galaxy S3 (running CM11) isn't showing at all under My Computer. The phone is set to MTP.

Under my computer the GT-i9300 shows up under 'Unspecified'. When I go into the device properties it shows up as Google Galaxy Nexus ADB Interface even though I have debugging mode turned off.

When I try to update the device manually to MTP USB Device or Samsung Mobile MTP Device I get an error saying "This device cannot start. (Code 10)"

I've tried un-installing and re-installing the drivers, as well as the registry tweaks mentioned in this XDA thread but I do not have the UpperFilter key present. I've also tried installing Kies and running the connection troubleshooter with no luck. Any suggestions please?

Many thanks
It appears that you are using Android Studio (or another IDE). Try turning on developer mode and then connect the device.