Computer can be either our friend, or our enemy. You will have to demonstrate your computer skills in an interview, so you should rather start building a friendly relationship to the machine.
Employers understand that we use software to prepare technical reports, charts, spreadsheets and other things (you can go around that with pen and calculator, but I don’t know many analyst who still do that in 21st century).
Microsoft Excel come to my mind as an easy answer. To say that you use MS Excel is a good answer, since it is a universal tool and it offers plenty of analytical, mathematical and statistical functions–if you can work with it.
But you should not forget that Excel isn’t the only tool out there, and stress that you believe that you can learn to work with any software for financial analysis, bearing in mind your high level of computer skills.
I prefer to use MS Excel, because I have been working with it since childhood. I am able to prepare illustrated technical reports and apply the most advanced mathematical and analytical functions the software offers. But I believe my computer intelligence is good enough to learn to work with any software, and to learn it quickly.
I like to use Reports Ultimate, as it is fast and offers a large variability of visual execution for both spreadsheets and charts, what helps when presenting my reports to people without sufficient knowledge of financial terminology. However, I am ready to learn to work with any other software you use in your business.
Side note: Recruiters may test your technical skills directly. They may sit you to a computer and give you a set of data and a chart to prepare, or a forecast to make. I suggest you to practice with Excel prior to the start of your interview, to avoid being embarrassed in a practical test.