mediadirect

So I have a brand new DELL XPS M1530, which has Vista pre-installed, and also comes with MediaDirect. Its been working good for about 2-3 wks, until today, whilst doing a normal power cycle to install some software, I inadvertently pressed the MediaDirect key (the little button with the house on it, just left of the power button). Now, before now, I had no idea what that button was. I'm still not sure what it is supposed to do, other than the end result was IT MADE MY SYSTEM COMPLETELY UNBOOTABLE!