Port 110 for POP3

I use NIS 2012  on a 64bit Windows 7 computer with 4 MBRAM and I have been blocked from port 110 so I am not able to configure email accounts as POP3.  IMAP works but for several reasons I prefer POP3.  I have created new rules for the firewall and have read just about everything I can find on the issue but the only thing that works is uninstalling NIS.

 

Any wisdom that anyone can impart would be most appreciated.  I have a bit less than a year on my subscription.