An update was just released that should address the issue, what I will need you to do is: It does appear that there was a hiccup with an update pushed out causing Windows XP machines to lose Internet connectivity. Kaspersky's response was posted by one of the forum users: Kaspersky did eventually acknowledge the problem, announcing a fix to the buggy update and offering a resolution. But those were deemed temporary solutions at best. Some IT admins said they were able to restore Internet access by shutting down the monitoring of certain ports or disabling the product's Web Anti-Virus component. One person who manages around 12,000 computers with KES installed noted a slew of calls to the help desk from users knocked offline. IT administrators who use Kaspersky Endpoint Security at their organizations chimed into the Kaspersky forum yesterday and today complaining of connectivity problems. Released yesterday, the update causes Windows XP computers to lose their connection to the Internet. Windows XP users who run certain Kaspersky antivirus software may find themselves offline after downloading a new update.