I’m an amateur technician for a textile company in the Philippines and I handle some of the repairing with hardware, software, and network for the company. One of our computers (an ID scanner for time in/out) running Windows XP SP3 got infected by a virus that creates random letters showing as an exception in Windows Firewall. And this computer’s ID scanning program would fail and then it would lose connection from its server but when scanned (with several virus scanning tools), cleaned, and restarted/rebooted, it gets fixed but then the same infection comes back again. What could be done about this issue and how can it be removed? Is the infection possibly a virus from the network of our servers? Please, any suggestions or help would be much appreciated.