Hello,
To compile your VI into an executable, you will need the Application Builder package for LabVIEW, which can be purchased on its own or as part of the Professional Development System package. If you are a student at university, you may wish to enquire with your school if they already have licenses available for you to use. For the fastest response to your question (and the most accurate cost information), you can call us directly at (888) 280-7645 from the US. If you are in a different country, just look for the Sales contact number on www.ni.com/contact
If I can be of further assistance, please let me know!
Cheers,
Matt Pollock
National Instruments