There are different WiFi's bro....
5 GHz band and 2.4 GHz band
In the 2.4 .GHz you have 802.11 B,G,N
In the 5 GHz you have 802.11 A,G,N,C
Speeds ranging from 1 Mb to 1 GB
Now if your router only does the 5 GHz band and your PC Wifi adapter only does the 2.4 GHz band, they will not see each other.
To be able to help you further I would need model numbers from both Equipements.