the computer is not restarting, unless it is in safe mode. it shows a black screen and it asks for restart in safe mode, with the last known configuration or start windows normally. The only selection that doesn't show the three options again is safe mode, and I don't know what I have to change to make it restart normally.
In safe mode it doesn't have internet connexion so I am writing this from the computer at work (the one that is bad is my computer at home)
I have norton antivirus installed, the last thing that I did (I think) is to turn off a setting in Norton to allow me to open office documents, because before I couldn't.