Hi Firfirikos,
Well, I have a very limited knoledge, but I think that it might give the techies some light on your problem if you go to:
Control Panel
System - Advance - booting and recuperation (Sorry, I'm trying to translate from french, so I think you'll understand what I mean), and click on "Parameter" which will open a new small window.
Can you tell us please, what it says litterally on the top as the default OS and the time fixed for booting?
after that if you press "Modify", it'll open a note pad. Please "Copy - Past" what is in it.
Hope you understand me. And I think that this will be useful for others.