I am having this problem, intermittently, on reboot. I installed Is2011 3 weeks ago on a new Win7 64bit HP notebook.
I checked that I have the latest driver for the Atheros AR9285 802.11b/g/n WiFi Adapter. Windows Network and Sharing shows that it is connected to the same profile as before reboot.
I notice this when I send something to my networked printer. The wireless adapter is there but the previous setting of Trust All is now Public and the static IP address of the printer (which I allowed) is gone.
This is early in my tracking of the problem. It is annoying more than anything else.