Can any Senior Technical Support person help me with this?

Their is a problem with my dads laptop, I am using an internet service of a local cell phone company. We use a wifi usb on our laptop to access internet through wireless . Their is an indoor device of Zyxel with which we connect our laptop wirelessly.

I have 2 Wifi USBs that I tried on Dads laptop one by one but both get error messege of "Limited and No Connectivity".

I have repaired,disabled and enabled both wifi connections but that didnot help.

No anti-virus is installed in dads computer and the windows firewall is disabled.

I have assigned the TCP/IP configuration manually to this laptop and then when I pinged the default gateway, it was giving reply messege successfully. But Internet is not working, I have checked the browser settings and it was fine.

I have also checked the drivers of this wifi USB on dads laptop and it was fine.

Both of these wifi USB cards are working fine on my laptop and I also have anti-virus in my laptop but I am not geting a messege
of "Limited and No Connectivity" and the internet service is
running fine .