I've visited the official website and found out that you're using a very old version of Loadcalc that doesn't benefit for support. Floppy disks are discontinued from some time now and the digital era has replaced them, meaning that you known can download the version from the official website and apply a serial number (that you must purchase) and that's it. The software will be unlocked and ready to be used.
Secondly, Electric and LoadCalc are somehow the same, but they're used with different cases. There is still a website where you can see the advantages and disadvantages.
Visit the official website to know more: http://www.necdesign.com/index.html