Procedure File Errors Out

Recently my IGOR file started getting errors and I lose the text in the file because it is replace with this message throughout the entire procedure file....

igor *** ERROR: Windows OS error of an unknown nature. (Windows OS error code: 59) ***
igor *** ERROR: Windows OS error of an unknown nature. (Windows OS error code: 59) ***
igor *** ERROR: Windows OS error of an unknown nature. (Windows OS error code: 59) ***
igor *** ERROR: Windows OS error of an unknown nature. (Windows OS error code: 59) ***
igor *** ERROR: Windows OS error of an unknown nature. (Windows OS error code: 59) ***
igor *** ERROR: Windows OS error of an unknown nature. (Windows OS error code: 59) ***
igor *** ERROR: Windows OS error of an unknown nature. (Windows OS error code: 59) ***

Any idea what the cause might be?

Thanks.