So a strange thing has been happening lately. When I close the lid on my laptop the unit usually goes to sleep mode. When I open the lid the laptop will come back on again (no rebooting or logging on, it just goes back to the state it was previously in, with all windows, processes, etc., continuing). A day or two ago I noticed that when I open the lid, the computer had rebooted itself and I'm at the login screen. After logging in there are two messages on the screen. One is the message telling me "Windows needs to install driver software for your Unknown Device" with three option buttons available. I have not installed anything new lately, so I don't know what it's talking about. The second message is, "Windows has recovered from an unexpected shut down".
I've attached a PDF of the windows I'm seeing. The "unexpected shutdown" window scrolls down to reveal additional info so I've copy and pasted the full length of that.
I'm not sure if this is a virus or something else. Any help would be appreciated. I'm using a Dell XPS M1330 and running Windows Vista.