Thanks Colin,
Since I couldn't see and option called "DFS", I did a scan of the area, and assigned it 44 since it was completely empty.
Hope this will fix it.
Thanks again.
I have one computer connected to the Ethernet port of an RT-N66U, some computers on 2.4GHz and some on 5.8GHz wireless.
The problem is that the router drops the 5.8GHz channel and it won't even show on the list when I mouse over the connection signal bar on windows 7 ultimate x64
after about 30...