I have 4 computers on a network - 2 wired & 2 (occasional on network) wireless. All 4 are showing the same symptoms: I can't get to get certain sites such as update.microsoft.com, download.microsoft.com, or any site with download in the name, www.malwarebytes.org, most antivirus web sites, online virus scanners, etc. I have tried to troubleshoot this problem for weeks & nothing seems to work! Three of the computers have XP SP2. One has Vista Sp1. The Vista machine is only a couple of months old. I have even used restore on it & it still has this virus. Noron Antivirus 2009, AVG, Sysem Suite 8, Avast, Kaspersky, Spy-bots, Ad-Aware, and others are unable to fix this problem. I can get into safe mode. Any help will be most gratefully received.