I will try to explain my problem as clear as possible but my knowledge about networks and routers is very limited.
I have a DIR-615 version:C1 firmware:3.13NA
My ISP is ATT DSL
Modem is Siemens SpeedStream 4100, it does not have a router built in
Internet line is connected from wall to modem, to router, to PC.
Ok, so after I upgraded the firmware I had no internet coming out of the router, I bypassed the router and connected straight to the PC and I got internet. I unplugged the power on both modem and router waited a whole night (I was too tired) and in the morning internet was back to PC and I had WIFI again BUT...

When I put a password on the WIFI network all my stuff finds the signal but cannot connect, if I open the signal meaning if I have no password and the WIFI is open I can connect all of my electronics without any problems.
I already tried using WEP and WPA but still unable to connect anything, I been leaving my signal open when I'm at home for the last week and I don't like it.
Before the update everything worked fine.
I don't know if this matters but I have a PS3, Wii, Roku box, Laptop and a couple cell phones connected to it. And there are like 6 or 7 network signals close to my house.
Please help me
