Unexpect BIOS setup screen

[Rootriver]

I was working in Outlook 2010 this morning. I clicked on an e-mail and the mouse was disabled. I was unable to do anything and then the BIOS setup screen came up. I escaped and did a normal startup from the Windows screen that came up and was able to work normally and shut down normally.

How should I diagnose and address the problem? I was using a Pentium 5 Toshiba laptop running Windows 7 Home Professional.

 

[Layback Bear]

The only thing I can think of is a key that enters the bios was stuck or unintentionally hit. I wouldn't change anything unless it happens again.