Hey
Those are POP (Post Office Protocol) errors, quite common, but we need to know what sort of program you are running.
Is it Outlook 2010 or another version? What version of Windows?
Can you go dirtectly to your email program, either Bigpond Webmail, or if you email is hosted on Windows Live, go to your outlook account? at least to get your important email.
There is also http://mail2web.com/ if you put in your email address and password, it can ususally pick it up, regardless of the browser you are using.
This will at least get you around the problem while you give us a bit more information so we can figure out what might need changing on your PC.