Hello, Yair Prokupetz
Welcome to Microsoft Community.
It's good that you're staying vigilant about unfamiliar files and folders on your computer. Let's break down what might be going on with those specific folders you've mentioned:
- C:\ProgramData\fltk.org: FLTK (Fast Light Toolkit) is an open-source, cross-platform GUI toolkit. It's often used by developers to create graphical interfaces for software. If you have installed software that was developed using FLTK, it might have created this folder to store necessary data. It's generally harmless but if you're sure you haven't installed any such applications or the folder is very old, it could be from a past application you've since removed.
- C:\ProgramData\SafeNet Sentinel: SafeNet Sentinel is a legitimate suite of software protection and licensing products. It's often used by software vendors to manage, enforce and monitor their programs' licensing. If you've installed professional or licensed software, particularly those that are high-value or industry-specific, they might utilize SafeNet Sentinel for their licensing needs. This is generally not something malicious.
If after all your research you are confident these folders are not needed and are not related to any current applications you use, you could delete them.
However, it's typically safer to rename or move them first and see if anything on your system stops working properly as a result. If after a few restarts and uses nothing seems amiss, you may then proceed to delete them.
Feel free to let me know if anything unclear.
Chandy |Microsoft Community Support Specialist