I have Windows XP and a Star GT-S5230, Maybe other Windows combinations will work here..
In trying to Upload from my mobile to my PC...
Obtain version 1.1.2.ID3 of the New PC Studio. In 2 days trying I found all other versions would not connect for me.
You can get this here.. Uninstall all previous versions.
Install and reboot..
Dont connect the USB cable yet.. Switch on the phone (mine didn't have a Sim card but still worked)..
Select Menu /Settings /Phone Settings /PC Connections (below screen) /Samsung PC Studio (select) /Save.
Now EXIT four times until you get the plain IDLE screen with just the Battery symbol at the top and touchpoints Keypad_Phonebook_Menu at the bottom.
This seems to be important..
Now connect the USB cable, phone end first then your PC..
Start the NPS program.. After a few seconds the GT-S5230 mobile icon should now appear at top right automatically..
Click on this to get a list of your phones folders and files.
Finally click on the My Computer symbol at top left to enable Drag and Drop in either direction...
I know I have been very fussy here but it worked for me.. maybe you can find short cuts in time...