Hi,
Welcome to Microsoft community where you can find the answers related to windows.
As per the description provided, it looks like you are unable to access Samsung Galaxy S3; it would be great if you could answers these questions in order to assist you further.
1. Which version of Windows operating system is installed in your computer?
2. Have you made any changes to the computer prior to this issue?
I would suggest you to try the following methods and check if it helps.
Method 1: Run the fixit and check whether the issue occurs.
Hardware devices are not working or are not detected in Windows (Fixit)
Method 2: Reset the USB Controllers and check if the issue persists. Perform Method 3 from the article.
USB port may stop working after you remove or insert a USB device****
We would be more than happy to help you further if the above steps did not resolve the issue.