Eversince the original installation disk is not working anymore (damaged) and the one person who wrote the program is no longer among us, I guess I have no other option left but to try, find and fix everything that is linked with the program in the registry and the Windows\system (32) folders.
If you have any tips as for where to look or what actions to take/avoid, I would be grateful to hear them.
Fyi, the program is used to calculate various gas pressures based on input from laboratorium analysis. Each main component exists of around 10 other components, each with their own specific P-V diagram. The program calculates the percentage of each component and then calculates the pressure of the mixture at any given temperature, based on the newly calculated mixture.
It has already been suggested to try and build an Excel spreadsheet, but I highly doubt it if anyone without not only knowledge of programming, but also good knowledge of Chemistry/thermodynamics will be able to build anything close to the program we (I) work with.