1: Used Trojan Remover to find any viruses, nothing.
2: I don't know how, but yesterday I went to Windows Firewall and it opened like it was always open o.o Not only that, shutting it off let me host :D
By the way, Trojan Remover is pretty good. One time I got a virus that disabled my virus scanners, spammed me with popups, and made fake icons for "Windows Firewall" and "Security Center" that went to some virus scanning site. Those icons were remade if you deleted them. Then I used Trojan Remover.
Not only did Trojan Remover actually turn on, it found all the stuff, stuff that remade icons and crap, and my computer was cured :D.