Error In Coral Draw while saving files

When i save a file after hardworking on it, it often make this error:

1st Error:   file copy error. temp drive or output drive may be full.
2nd Error: error writing <here file name which i m making>

after this error coral draw does not do any other work, it not save file, export file and donot to do else.

Plz tell how can i resolve it.

Thanks

Mohsin