Strange popup window
27" iMac 2009
2.66 ghz intel i5 12 gb RAM
OSX 10.7.5
I have recently had a popup window start appearing on bootup that says "you have joined a new network. please choose which profile you wish to apply" and it has a drop down choice of home, work and public.
totally out of the blue. No new apps, or even hardware like routers or network devices.
does this sound familiar to anyone?
Thanks for any and all help.