I tell you what (Hank Hill voice), I am tired of dealing with Samsung’s terrible USB driver packages. I have installed them on three separate computers – two desktops, one laptop – and not one instance worked properly without further configuration or tweaks.

Doesn’t matter how many times you install and remove KIES or play with device manager, MTP refuses to work. UNLESS you go in to the registry and delete a key.

-_-

This doesn’t work in all cases, but it solved the problems on my machines. I still get intermittent USB errors, but I am still able to see my devices and flash new ROMs/firmware through Odin so It’s all good. For now.

http://www.onger.net/?p=1401 – the registry information

One of the devices I was working with (and older Tab Plus 7, trying to upgrade from 4.0.4 to 4.1.2)

http://androidromupdate.com/2013/05/14/upgrade-samsung-galaxy-tab-7-0-p6210-wifi-jelly-bean-update/

Additional troubleshooting:
http://colekcolek.com/2011/12/23/fix-mtp-driver/