Port 80 is redirected to 30606 and No webpage is opened!

Hi,
I have ESET Smart Security on my laptop.
Recently, I have found that one threat may corrupted some settings on my computer! I can not open any website that uses the default http port(80) on my computer! Every HTTP communication I make on my computer is redirected to port 30606!
I have found this analyzing my computer communication using CurrPorts v1.36.
This problem is solved when I use proxy servers that use another ports. Whenever, I set them in IE or Firefox. It works correctly.
It may be because of a threat that may not be detected by the ESS.
Please, help me solve the problem. How can I change the port back to communicate through port 80?

Thanks

 

Any http and pop3 communication is redirected through port 30606 for checking by ESS/EAV. You can disable http/pop3 filtering if you use a proxy software that interferes with ESS/EAV.