For the last weeks I've been suffering a problem with a Windows 7 laptop formatted only 2 months ago. From time to time the system complete freezes for a minute or so, and then it continues working as if nothing had happened. In the meanwhile I can't even move the mouse.
I had the impression that sometimes it happened when watching videos, but now I'm almost sure it has something to do with that. Now, if I open youtube, when I try to play a video I'll se 2 seconds or so, and the computer will freeze for a minute before resuming.
What can I do / what additional tests should I try to detect the problem?