A: 

You can find a list of them all here:

http://en.kioskea.net/faq/2347-error-codes-in-windows

Then just do a search for 'Serial' and use whichever one best fits your error

w69rdy
Thanks for the link, but the MSDN site shows that the error codes go up to 15,999. http://msdn.microsoft.com/en-us/library/ms681381%28VS.85%29.aspx
Jim Fell