Connected to Wi-Fi network, but unable to access the Internet ipad 2

Hello,
i baught a new ipad 2 32 gb , 3g.... 4.3.5os
i am having an annoying issue regarding the internet connection..
where i am living i cannot connect a router so my laptop has a cable connected to it to access internet ... i had to create an ad-hoc ( to make my laptop work as a router)
( windows 7 btw)
now my iphone connect fine and i can browse internet, but when it comes to my ipad it only connects to the wi-fi but when i open the safari , a message pops up saying no internet connection eventhough as i said it's connected to WIFI with full signal !!
this is really frustrating and i've read many many blogs about this issue but none of them solved my problem and this was my last option is to send u guys askin for help...
p.s: i tried to click on renew lease but nothing is changed
ip adress : 169.254.90.xxx
subnet mask:255.255.0.0
router : blank
dns:blank

Try using an explict DNS server, such as
208.67.222.222 (OpenDNS server)
8.8.8.8 (Google DNS server)
System Preferences -> Network -> Advanced -> DNS -> [+]
The first entry you add (at the top of the list) will be the primary DNS server.

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