Are you using windows xp service pack 2 ? Already we know windows provides the security update for windows xp service pack 2 on every month 2nd tuesday. Security update for windows xp service pack 2 is ended on july 13, 2010. What happen if you not install that update? Hackers , virus etc can easily enter into your system, But one good news, still security update for service pack 3 is available. So who are use an service pack 2 upgrade to service pack 3. Update the antivirus daily and scan the whole system for every 2 days. I dont know security update for service pack 3 end date. So who are surfing the net using service pack 2 is danger. So upgrade to service pack 3.