Need to run a windows accounting program in Late 2009 iMac

I have the above machine and would like to run a windows based accounting program that can run on either Windows 8 or 10. I dont have either so will have to buy whatever I choose. I am running High Sierra 10.13.6 with 12 GB of Ram. I am not the super tech type so lets put that out there. I will infrequently run this accounting software a couple times per month. I have an old Parallels 9/windows 7 this just creeps along and is basically worthless. Based on how infrequently I need it, what would be the best/cheapest/most convenient method to move forward? My system sometimes get hung up while restarting so I like the Parallels approach but I am very open to suggestions.