As you have SATRANS for both data sets, I would suggest renaming SRASP, and try re-installing Sales Analysis 6.5A. You may also want to try moving the data to a local hard drive, set up a new start list entry for the C: location of the data, and attempt the conversion again. This is to remove any network rights or other such complications.

This is indeeed unusual as you were able to convert 1 data set successfully.