Hi, my name is Jose. I'm an Independent Advisor and a Windows user like you. I'll be glad to help you today.
ProgramData is a Windows folder that store applications settings. If you deleted it, Your applications will start to fail. The Recovery folder has the recovery environment.
If you need to increase the free space, you can use the Disk cleanup tool. Please, select the start button and type Disk cleanup. Then click Clean up system files. You can select many options to free up disk space, and click ok button.
Please let me know if you need any further assistance.