After coming back from vacation I booted up my Toshiba laptop (with Vista) and couldn't get on the internet through my wireless router so I ran the cable from my modem to my laptop and did what I needed to do. After I finished I used the little shutdown command that comes up after clicking on the start button and the computer shut down.Good so far. Then it started back up about two minutes later and after that everytime I told it to shutdown it would restart, sometimes two minutes later and sometimes five minutes later. The only way to prevent it was to disconnect the internet cable from the computer. I downloaded new firmware for my D-Link router as there wasn't any other way (after trying for an hour) to get it going and am now wireless again which is nice. But I don't know nor can the modem supplier tell me, why when the laptop is hardwired to the modem it keeps booting back up. It all worked great before I went on vacation. I had unplugged everything while away and there wasn't anyone at my place so it wasn't used or abused by anyone. I ran Malwarebytes but didn't find anything. Could you please help me understand what may have happened.