Hi there Trevor. My name is ***** ***** that you have had to wait a bit for an answer. I'm sorry about that. I'll do my best to help you. I'll need to ask a few questions in order to best assist you. Are you using the built-in Windows Firewall or a 3rd party firewall?
It is quite possible that you have something like a trojan, or rootkit, or other type of malware that has been installed on to your computer. This software is often installed unknowingly when you download other files. I think the best place to begin is by preforming a complete and thorough scan of your computer in safe mode. I am uploading detailed instructions in pdf format. You may want to print them out as you will need to reboot the computer into safe mode as part of the process.
If you'd like, I can offer the PREMIUM SERVICE of a SECURE REMOTE CONNECTION. This will allow me to see exactly what is happening on your computer and to work on the problem while you watch. This is completely optional. If you'd prefer to do it on your own, you should be able to using the instructions that I have provided.
After your computer has been thoroughly scanned and cleaned, we will look at your firewall configuration and the other settings that you mentioned. Cleaning the computer may resolve the problem and rest them, but if not, I will walk you through doing that manually.
I see that you are offline at this time. I will be only be here for a little while longer tonight myself. Please let me know what would be the best time to continue and what time zone you are in. I am in CST.
Thank you Trevor. They have to have installed something on your computer, either physically (if they had direct access to your computer) or remotely (perhaps attached to a seemingly innocent download). If you're unable to detect the program that they are using for access with the instructions that I provided, you may want to consider a Windows 10 "refresh". This will reset all of your system files to their original state while preserving your documents and photos. You will usually have to reinstall your software, such as printer drivers, and programs. Please keep me posted as to your progress. If you do need to perform a system refresh I will be happy to provided detailed instructions.