None Of My Devices (excluding My Pc) Will Connect To My Wireless Router. Can Anyone Tell Me Whats Going On?

It seems my router has decided to shun my DSi, 3DS, iPad 2, iPod Touch, and my Wii, though it works just fine with my PC. It started about a week ago with my DSi and 3DS. Neither of them would connect to the internet. Then, a few days later, I tried to connect to the internet from my iPad 2. It wouldn’t, of course. It shows the connection icon in the top left corner, but when I try to open Safari it says: Safari cannot open the page because it is not connected to the internet. The same exact situation applies to my iPod Touch. Earlier today I tried connecting my Wii to the internet. No luck. it gives me the error code: 52030. I looked it up. No help at all. I am really getting impatient with this whole situation. I have tried a number of things but none of them helped. I tried resetting connections, turning things off and back on, rebooting things, renewing leases, moving to different rooms, moving right next to the router. Checking the routers status with my computer, messing with security settings; pretty much everything I found on the web, I tried. I already asked this question, but it has been up for 2 days and has not been answered once. I would really like to get at least some suggestions. Please, if you have even the slightest idea, shoot me an answer. I’m desperate! Thanks.
EXTRA INFORMATION: Thanks for the advice Hayley, but that wasn’t it. The MAC Address filter is off. While I was at it, I tried checking it and then un-checking it. But to check it, it first asked me to log in with my router password. I did, the website said: Login failed. I clicked: Forgot Password. It gave me a hint: System password on label. That’s the one I’ve been typing! So I went back to check it, just to be sure. Everything checked out. So I still type the same password and it says: Login failed. When this happens, Internet Explorer 9 asks me if I want to turn Intranet settings on. It says that if I do turn on Intranet settings, it wont be as secure. I’m not sure what that is all about. Any other ideas?