Windows to iPad transfer port in use error #2002

When beginning an upload from the Windows 7 App to the iPad, I get a popup stating that port 57777 may be in use, specify another port, and the error number 2002.  The transfer then begins normally, but if it consists of a large number of files, the Windows App then crashes.  Smaller number of files seem to work okay.  Are the message and the crash related?  What can/should be done about the possible port conflict?

Thanks