PS3 and Internet problem?

Ok so this morning I woke up and decided to play Black Ops. My internet was fine and nothing was wrong.I was popping on and off all day.At about 6 P.M. I was done for the night. At about 10:00 PM later that night I go to get back on and it won’t let me on. It said something like error code 801001FF. My internet sucks anyway. Good connection, just not consistent. We have comcast phone and <a href="http://www.toryburchsshop.com/"><strong>tory burch sale</strong></a> internet with the linkseys router. We have the router hooked up to a modem for the phone. We use ether net cords from the router to the computer. The computer has Windows 7. It’s <a href="http://www.toryburchsshop.com/tory-burch-flats-c-6.html"><strong>Tory Burch Flats</strong></a> occasionally bugging out so I’ll go unplug then plug it back in and it’s fine, but not tonight. The internet works fine on the computer and WiFi on my iPod Touch fine also. It even comes up with 90% connectivity on my PS3. I do a test real quick and it says obtained IP adress but will never connect to the internet, but my WiFi on my touch can? Please I need help. And also we have two PS3′s on our network and everytime you turn one on it kicks the other one off for a second. How to fix this problem? And one more. If our computer is all the way shutdown, the network, <a href="http://www.yaoxue8.com/plus/guestbook.php"><strong>Cheap wholesale designer handbags miami On Sale | Brand Name Handbags</strong></a> linkseys, dissapears. How do I make it to where the computer can be seperat from the router and have a connection of it’s own and not use the computer? The last two questions dont have anything to do with what happened tonight, that has always happened.