If you reinstall Windows in your PC you will have to reinstall all of the programs from their original installation media. You cannot simply copy existing program folders and then restore them afterwards.
Before reinstalling Windows, download and run Belarc Advisor click here then print out the results. This will detail all of the hardware and software installed in the PC, including the Product Keys used to install any software. It will also be helpful should you need to search for any additional drivers.