Hi all...I have a regular laptop...Toshiba...with Windows Vista for OS. I too have recently been experiencing the problem where my laptop shuts down by itself with no warning. At first I thought maybe my battery pack to it had overheated (even though I was running on electric, like i always do), so I immediately turned on some fans nearby. The problem is still ongoing. If anyone has any suggestions on what the problem is and how to fix it I would be greatly appreciative. I am an on-line poker player playing for real money and it is really annoying to be in the middle of a game and have your computer turn off.