Kies is your friend...
Samsung Kies, Free Download Kies 3, Latest PC Suite, Mobile Software, Window 7 PC
You may also have to use a tool to clear out all the Samsung and Android USB drivers so when you next plug in it will install a fresh copy. I like this tool:
View any installed/connected USB device on your system
You may also want to ask our Android having friends:
Ask Anything - Android Forums at AndroidCentral.com
If you need to add additional information or want to post additional questions, please join the site so you can see the reply button and continue the conversation in the same thread you originally made.