thank you all very much!!!

so, will this do it?
Amazon.com: Edimax EW-7811UAC 11AC Dualband USB Adapter with High Gain Antenna and Free USB Extension Cradle for Better Signal Reception Accessories

if the specks reads "supports 802.11ac" it's not enough??

it's A and not AC but from what i read in forums it should at least detect it right? should be there on the advanced tab list.
it's a 4 year old pci adapter.
Samuria: you mean the router may not...

hi guys,
i have searched a lot and did not find any solution to my problem (or, in fact, someone with my exact problem)
my wireless PCI adapter supports 802.11a so it should have 5ghz recognizing...