You should turn off file sharing in Windows 7.
Windows 7
Follow these steps to disable File Sharing on Windows 7:
Click the Windows Logo button.
Type file sharing in the search results window, and then touch Enter.
Under "File and Printer Sharing", check to be sure that Turn off file and printer sharing is selected.
Under "Public Folder Sharing", check to be sure that Turn off public folder sharing is selected.
Click Save Changes.