Problem accessing internet after installing Lion

Hello,
I just installed Lion to my Mac (Mac OS X Lion 10.7.3), and somehow I now seem to have trouble accessing internet. I use Wi-fi, and the actual connection with our internetprovider works just fine (we have other computers in the house, and have not experienced any trouble with them). When I want to use internet I have to go to the network panel, click on "help me", and run a diagnostics. After that, I have no problem assessing internet.
I am SO sorry I am not able to explain my problem any better in english, but I do hope someone can help me sort this out, as it is most annoying.
Hopsi Daisy

Sorry, my bad for not explaining good enough!
When I start the diagnostics, the networkstatus on my left indicates with green dots that everything up until networkprovider is OK (Wi-Fi settings and network settings are all green)
Networkprovider is marked with a yellow dot, and internet and servant (? - not sure of the english word here!) are both red, indicating they do not work.
I then run the diagnostics, no problems encountered, and I am up and running. It does not say what the problem is, nor do I get any indications that something is wrong when trying to access internet in the first place (other than that it will not let me in to the pages I am trying to visit)
This happens everytime I for some reason restart the computer, or if I have been offline for a while (e.g. throughout the night). No problems once I am online.
Never had any such problems until I installed Lion.

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