I opened the port, but it says it's closed

Hello, I know the forum is probably flooded with this but I couldn't find my exact problem so...

My internet usually turns off and I have to fiddle with the modem and router. I'm not sure what the problem is and haven't gotten a straight answer yet, and I'm not the best with this kind of stuff. I just got a new computer with windows 8 and tried using SoulseekQT and classic Soulseek and both of them say the port is closed, even though I opened it. I also have a static IP since I go through a router (Belkin).

My old laptop usually works decently with soulseek though. It would say the port was closed and then I'd reset the router and it would say it's open, but that's it really. And uTorrent appears to be working fine on my new computer. Could it be that my modem and router are no good? Or is it my computer? Or even my ISP?