Hi guys !
Thanks again for your replies.
@vjudeu:
I learned a lot about clearing all my traffic with my windows Firewall. I also learned that whonix and other OS exists, but i wanna continue to do it with windows for the moment.
I also decided to disable all the in-bound traffic, and disabled all out-bound traffic too.
Then I created a rule in order to open the 443 TCP port. All net traffic is also encrypted, through TOR.
The only weird thing is that I still had a weird ip that were sending and receiving things from / to my computer. After a few researchs, i guess it's the TOR node output.
I also think that, now, all my clearnet traffic is disabled and all my net traffic is encrypted, through TOR (this PC doesn't use an other browser / is especially for my node & ESP).
If you've any advice, it would be with pleasure

Thanks again !