mn-700 mn-720

I can't see my laptop from my desktop and vice versa. it
kinda freezes when i click on my network places. I have
the mn-700 connected to my desktop and my laptop uses an
mn-720. Both can get to the internet great but can't see
each other. i checked the workgroup names, and run the
wireless setup wizard a million times. i don't know what
else to do. please help