Modernize DBase Rental Program

I originally built my rental-management system in DBase/Clipper and it has served me well for years. I now need the entire application rebuilt as a native Windows desktop program so that it runs smoothly on current versions of Windows without the old DOS layer... (Budget: $250 - $750 USD, Jobs: C# Programming, Database Management, Desktop Application, Payment Processing, Software Development, Software Engineering, Testing / QA)