Just got a router, need help opening ports
 

I just got a linksys router BEFSR41 and I want to know how to open ports so I can use filesharing programs like Bit Torrent. Any ideas?

I have that same one! I use port forwarding to do things like that, it's in the advanced tab of the web access. If you need more details, let me know.

you gotta set up a static ip for your computer thats not in the range of the router

ie. router=192.168.1.1
range = 192.168.1.100-254

computer = 192.168.1.20
subnet = 255.255.255.0
gateway = 192.168.1.1 (router address)
dns domain = whatever
dns host = whatever
dnsservers = go into the linksys router and look at the status page and the dns settings, usually the first two are the only ones needed

after that, go into the advanced tab and then the forwarding tab and enter in the static address you just set up for your computer
bit torrent uses ports 6881-6889 so enter these numbers and cleck the tcp and enable boxes, fill in an app name(bits or something) and click apply.

This should set up the right ports for bittorrents on your computer

just a little nitpicking here, but
should be 192.168.1.100-254 (you forget a 1)

sorry, was typing too fast

Couldn't you just set that pc as the DMZ host?

Thats as bad as not having a firewall/router. Opening ports is the best way for sure.