I am using Laptop through wifi connection. I was having problems in browsing too many adds were appearing and internet speed was slowing and date and clock goes back to October 2005 every time I open it. Somebody suggest to reinstalled window. After re-installation, adds stop to appear, but the time issue didn't solve and encountered another problem of frequent disconnectivity of internet connection. I installed Avast for virus scan. But Avast blocks google and other sites from opening. I installed AVG for protection. But AVG fails to update and it says your system is at high risk. If run scan it gets interrupted. Please somebody tell me how to solve this issue. As I am completely frustrated by frequent disconnectivity.