Have a look to the following Steps
Step 1 # Try cleanup and reinstall of drivers
- Pull the SIM card out and do a factory reset with format
Step 2 # You can to use Samsung KIES (software for PC), or get your PC to recognize the "MTP" USB mode.
- http://android.stackexchange.com/questions/21854/can-i-disable-mtp-mode-and-just-have-a-regular-usb-connectionCan I disable MTP mode and just have a regular USB connection?
- http://android.stackexchange.com/questions/33264/samsung-galaxy-s3-not-connecting-via-usbSamsung Galaxy S3 not connecting via USB
Step 3 # Make sure you install the Samsung USB Driver for Mobile Phone
Step 4 # For file transfers, you can use Airdroid, which connects through wifi.