Yesterday I installed two 52" Hunter greenline fans with remotes. Now, when I turn on the lights, in the low setting them dim or flicker on and off, on the high setting the fans have a buzzing sound. Also, since the install my flatscreen in the front of the house buzzes. Could it be interferring with my wireless internet system or is this an electrical problem.. I did change the rooms light switches to 20 amp light switches..

Are they Fluorescent Bulbs? Switch should be OK. Buzzing can be fromGlass Light shades.
It shouldn't effect your Wireless, although defective receivers can radiate RF.
Turn off that circuit and see if Buzzing stops on Flat Screen.

I second Strat's question about CFLs.