Strange connection issues...

Can you access the wireless router from your other computers in the same location as your PC that's having the problems? Maybe there's some sort of interference problem preventing it from communicating properly. It might be worth a few minutes trying to fiddle with the Channel # your network is running over.

Other things I can think of is turning off all firewalls/security features on Windows and your router and seeing if that lets you connect.

Also, can you ping the Macs with your PC when using wireless, or vice versa?

And, if you don't know how to connect in to the router (which I'd recommend trying to do from your PC), it's usually either the IP address 192.168.0.1 or 192.168.1.1. You can generally find the default password online if you look around a little bit (common defaults are blank/blank, admin/blank, admin/admin, admin/password, admin/1234, etc).

Have you looked for any sort of updates for your wireless card?

Finally, and I know this shouldn't effect anything, but is it a Wireless N router that, for some reason, isn't properly backwards compatible with B/G?

Jam it back in, in the dark.

Channel number is the frequency at which the router works. So, like, say you have a wireless phone right next your desktop or PS3 that could cause interference since many wireless phones and home networks run on the same frequency. I know in one of my old apartments I'd lose wireless whenever my neighbor or I would use a microwave.

If you can't connect to the internet through the router even when you're plugged in, then there's probably something crazy weird with the router and the only suggestion I could try is bring it to a friend's house and see if their PCs will work with it.

Wireless N is a different protocol for wireless internet in the same way that 802.11b and 802.11g are different. I think it operates on the same frequencies (someone else here probably knows for sure and can verify), so generally it's backwards compatible. For example, 802.11g is rated at 54Mb/sec while 802.11b is rated at something like 11Mb/sec. However, since they're broadcast on the same frequency the router can interact with both b and g devices. What I'm thinking is maybe the Macs are using B while the PCs are trying to use G and there's some sort of issue going on there (or insert N for any of the possible combinations). It might be worth seeing if your macs run on b, g, or n and comparing that to what your PC and PS3 are using.

There's nowhere I can't reach.

I think what he's saying to try is turning all of your devices that use the router off. Then turn them on one by one. So do a factory reset or firmware upgrade or whatever with EVERYTHING off, then just turn on your PC. See if it works then.

This thing is sticky, and I don't like it. I don't appreciate it.