UPDATE:
OMG!!! I have a new problem! I was watching youtube again then when I played the video, a song just started to play! I noticed that the volume for the youtube video was on mute. But even if the music is playing there is no open window in the toolbar. Itunes, Realplayer, Media player is not open, the song just started on itself.
I closed all the windows and working programs but the music was still playing, I opened Itunes and played a file, but it played simultaneously with the recent music!
I suspect my computer is in big trouble now, please anyone help, this is the first time it happened to me.
Oh I forgot to mention that I was downloading a movie using Bitcomet. It was the only program that I forgot to close since I restarted the computer.
I am currently watching Marrying the Mafia 3 on Youtube, but the rebooting problem and the ghost music did not recur.
BTW the rebooting problem did not happen since I asked for help here, eheheeehe what a coincidence