I have a Acer Aspire One 722 netbook and there are times when the system hangs and does not respond. The cursor does not move and there is NO option to "Restart Windows Explorer"( a common option when your system hangs). I am waiting for this to show (about 10 mins) but nothing happens. Only a beeping sound is heard from my system but it does not came from the inside of the laptop but from the audio speaker. The only thing I would do is to restart it manually(by pushing the restart button). Now my files had not been saved. But, fortunately the unresponsive instances does not happen every time I switch on my netbook. Any suggestions or comment about this.