My win 8.1 laptop can only see the 2.4 Ghz but cannot see the 5Ghz network on my Belkin N600 router although my older Win7 Laptop can see both. My new Win 8.1 laptop is an Acer E1-510, 8Gb RAM, 1TB HDD, 2.16 GHz twin core processor, about 6 months old.