Vista - SP1: no more internet connection via wireless after install

After I had installed SP1, my internet connection was vanished.
The connection to my wireless was reported limited.
When I clicked to verify the connection to my wireless, a problem with the
wireless network connection was diagnosed. I was advised to check for
internet protocol and driver installment.
Hardware management (Dutch:"apparaatbeheer") reported "working correct" for
the Atheros AR5007EG wireless network adapter.
When I removed SP1, the connection to my wireless and the internet worked
fine again.

So, no SP1 for me. and one more bug to add to the SP1 buglist.