WLAN Auto-config Switches Off And On After Boot?

PC boots normally, though somehow slowly � you can really hear the HD is working hard! Wireless is connected as it should, as one of the last tasks in the entire start up process. Good signal with 4-5 pins in the internet access icon down in the right corner of the lower menu bar, and no problems with connection to the internet. However, after 1 minute or so, I can hear the HD start working intensively again, and then it disconnects the internet access, shown by a red cross over the internet access icon. Just before that, the screen flashes a bit, and the color of the lower menu bar becomes slightly more pale, as if some booting is still going on. Going into the Services.msc, the WLAN Auto Config says that it is started, but opening it in �General�, it says Stop. When I click on Start, it reconnects and works fine again. If I do nothing, after yet another 2-3 minutes it tries to reconnect, and eventually after 5-8 minutes after reboot it is reconnected, and work fine again. I off course use Antivirus program (Microsoft Essentials) and have installed all the latest Windows 7 updates, including SP1.