Hope you solved it Kerazo, if not try opening cmd (command prompt from start menu) and type in
"ipconfig /release" then type "ipconfig /renew" and finally "ipconfig /flushdns".
It doesn't hurt any of your configurations and will only very temporarily halt your internet connection (when released, until renewed).
Consider restarting your pc and resetting your modem if those are available and the above doesn't solve your issue.
Also make sure you don't have multiple core.exe running since they may cause conflicts and ensure your firewall (windows or otherwise) has rules explicitly allowing core.exe to both go inbound and outbound.
Given all those it's hard to think it wouldn't work.