how do you charge a Samsung galaxy tab 2 on your computer with a usb? I plug it in and all it does is ask to import files. I j

you cant. there is a trick that sometimes work plug it in slowly then you will hear it beep and it will charge do not plug it in all the way. works for some.
 
in win7 pro its under control panel> hardware and sound> Autoplay
then find your device and use the dropdown to select "Take No Action"