No OSX program suggestions, but..
If it comes down to using Windows apps, WINE is available for OSX without having to emulate/install/configure/boot a whole new OS to just run a few Windows applications. http://www.winehq.org/
There's also CrossOver, which is a commercial version of WINE: http://www.codeweavers.com/products/
. If you want to emulate Windows, consider running Win98 if the app will run in it. Less memory to use in your virtual machine and it'll tax OSX less.
There's also the options fo going to an online system for your record keeping needs, and it'll work on any computer/phone/tablet you use.