laptop does not connect to internet wirelessly but does wired??

I have a Sony Viao running win 7 pro. This machine connected to the internet wirelessly OK in China but have arrived back home for xMas and tried to connect to parents network. It is fine if connected via the ethernet cable but not wireless. My parents have laptops which connect fine to the wireless router. My laptop finds the router OK and shows connected and have entered the security key OK and good signal but no internet. Please help
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tough to say as that can be a broad question

I would check for any static settings on the wireless adapter
make sure your IP info it is getting when connected is correct.

Outside of that
can you connect wirelessly testing on any other networks - like at a starbucks, etc.
Do you get any error messages when you connect via the wireless network?

The symptoms sound like you might have a static IP configured on the wireless adapter. Open control panel, Network, change network adapter settings and open the properties of the wireless network adapter.  Open the properties for TCP/IP and check that the settings are set to acquire automatically (DHCP), not static.

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Faisal KhanCommented:
May be your wireless connection is setup to get manual ip address instead of automatic. try checking you IP address settings. it should say Automatic. here is link for guideline how to change.

if this does not help, then worth checking your parents laptop settings. What does their laptop say? Automatic or manual? if their is also setup on manual then chnage yours accordingly.
hope this would help.
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OR could have a static IP setting on your adapter
comautokAuthor Commented:
You guys were on the right track. Obtain and IP address automatically was checked but the use the following DNS server was also checked for some reason. Checked the obtain the DNS server automatically and all was good. Thanks for your help. Awarding 50/50
Faisal KhanCommented:
:) Great. well manual ip mean ip + dns. glad you are live now:)
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