Local access only after 2011 update

Hi,

 

I recently allowed live update to upgrade my norton product to the 2011 version. However immediately, and only, after doing so I can no longer access the internet through a wireless connection to my router. Direct ethernet connection works fine. I am only able to obtain local access, and the network is unidentifiable. This has never happened before, and only occured after I upgraded norton, so it is fair to consider it a likely cause. I am running Vista, which is known to have problems with this, but like I've said, it only began happening to me after the upgrade.

 

Anyone know what could be the cause?

 

Best wishes.