Issues with Airport Utility

I'm having issues with Airport Utility...

I'm not able to see my time capsule or my other router on my iMac. I'm connected to my TC via wireless. But with my laptop, I'm able to see them. Also connected to my TC via wireless.

The pic of just the internet is my iMac. The pic with both the routers is my laptop.

I've tried deleting the app, but the captain won't let me. I was however able to delete the prefs file.

Any thoughts/ideas?

iMac is 2011 27" 3.4/i7