ill be as accurate as possible.
sunday 13th 2013 between 245pm - 3pm i locked my computer and went to the kitchen for a minute or two, i came back to find my computer somehow managed to restart by itself, and on the 'Dell Logo' screen, with a message that reads 'program installing please wait' and a line going left to right, right to left, below the message indicating the changes.
the computer then came back on the lock screen, i typed my password to bring me onto the desktop, the anti virus (kaspersky) did not start as normal but greyed out and a 'i' (<~~ i think it was this sign) i clicked the 'K' near the clock, and after 30-45 seconds the AV turned on. i then clicked firefox, it automatically directed me to my youtube channel webpage, the very webpage i was on before i locked the screen and went to the kitchen before the system restarted by itself - shouldn't any system restart launch the firefox homepage?
earlier on the day between 8pm and 10pm i installed windows update and xbox controller software (genuine CD) on both occasions i restarted the PC.
i've never known windows update or any other software to 'program installing please wait' when on the 'Dell Logo' screen, and this is what's bugging me most.
i checked the 'program and features' and there was nothing suspicious or any new programs other than what i know to be installed on the PC.
can you please shed some light as to what this could be, i've never known anything to instal, or give a message of installing when on the 'Dell Logo' screen - everything about this seems out of character
just to add to that, if this information helps, on 12/10/13 i had a network attack that was blocked 'Intrusion.Win.MSSQL.worm.Helkern' and i made the amateur mistake of doing a system restore yesterday to a previous state on a whim.