For what reason are you connecting your phone via USB to your PC exactly?
Once its connected, it will take your pc a while to find all the drivers and install them, once thats done the only thing you can use the PC Studio software for is to transfer files from your PC to your phones SD card. You will not be able to manage anything else through the software including messages/contacts etc
If you just want to transfer files from PC to phone, its much easyer to just take the micro SD card out your phone, insert it into the adapter supplied in the phone box, and plug the SD card adapter containing your micro sd card into a card reader on your PC.
If your pc does not have a card reader, but you have a digital camera/camcorder that does have an SD card slot, put the SD card adapter into that device and then connect the device to your PC and turn it on, you will be able to access the SD card through the device by using the 'My Computer' icon on your start menu/desktop and going to the 'removable drive'
Also read Here
and some good tips Here