Added usb wan n adapter to a wan g laptop but cant get it to work

i have got a integrated wifi g in my laptop and it worked great however i added a wifi n usb adapter so i could benefit from my new wireless n router and get greater speeds

but i can't for the life of me get the new wifi n adapter to take over the running of my laptops network or internet

i tried deleting the wireless network 1 and disabling the intergrated wifi g adapter and restarting the machine

but it only allows the wireless network 2 access for a short time then it cuts off with an x in it in the taskbar in windows 7 premium

in troubleshoot problems, resetting the adapter brings the network back online for a minute then it loses connection again

can anyone help me with this ???

maybe give me a run through ???

thanks


ijwia