can't connect to the internet on just ONE computer

I have Verizon fios high speed Internet. I also run a wireless router from it
for my older models that work with b/g, not n. my son's computer (3weeks old) is
all of a sudden not connecting to the Internet on either wireless network
(original Verizon router or the net gear). iPad and other devices are having no
problems, so I'm assuming it's not the router. Just this one laptop isn't
working. I tried all the usual amateur troub shooting like resetting the router,
the comp, windows help, but nothing will get this one to connect to the
Internet. It does say that it is connected to the router, but no int net access.
Please advise me.

I tried to copy and paste the ipconfig into this box, but couldn't seem to figure out how, but I attached the picture file. Thanks

"my son's computer (3weeks old) is
all of a sudden not connecting to the Internet"

was it connecting before??

did someone (your son perhaps) change any network settings on your son's machine?

check the settings shown in the attached picture (on your son's machine)

was it connecting before?? Yes

did someone (your son perhaps) change any network settings on your son's machine? No

Tanya c
I have a decent pc knowledge, but I would say my weakest area is network.
I thank you for all that info, but it is a bit much to process with these 4 kids running circles around me. I checked dinesh's thing, but it didn't seem to address wireless connections after I did the first couple of steps.
The main thing that is tripping me up is that it was working fine and then all of a sudden, not.
The modem is a Verizon fios modem made by actiontec. That's running n. I also have a netgear router for the b,g older devices hooked up to it. Like I said, the other devices are connecting. Be gentle with me and please tell me what you think would be the cause of this, and what would be, let's say, the first couple of things to check.
Thanks

As dinesh's suggested I did a system restore. Now the pc is conn but only to the netgear b,g. It wouldn't conn to the original source of the fios modem. I'm afraid to play around with it b/c my son is finally able to play the all consuming minecraft.

i am not able to connect my pc via wifi router of tp link but the same pc connect with my phone via hot spot by connecting the tp.link the pc says limtid acces plz help me

Hello, maybe someone could help please. My network slowed down recently and occasionally is cutting me off completely. There are three other computers connected to that network and the problem happens occurs only on mine. It supposed to be the fibre optic network . Tried to flush the dns, did not help at all. I did the ping tracing but don`t understand the results. Please see attached screenshot Thank you very much for your help.