From last few days my touch screen net book is working very slowly I really can’t understand why? Some time whole system restart automatically. For fixing the problem I have scanned the whole system with the antivirus but no virus found. I have a genuine Norton antivirus and I don’t think that it is happening due to virus. I really don’t want to install a new OS because I have to purchase it and I don’t want to spend that much money on it. So I want to ask from you people, what should I do?