Windows 7 wifi non-connection

I have a P5P77 LX motherboard, i5 650 processor,8 GB memory and have tried two different wifi USB adapters trying to access my Verison ‘5-spot’ internet connection. Windows 7 Ultimate will acknowledge that something is in the USB port but each device’s software fails to find any usuable device. I fought this for a couple months and finally took the devices to a friend’s house and both devices and soft ware work fine on his computer. Please help, as w/o the internet this computer is just an over-priced game consel(sp)…….sending this from wife’s laptop.