To find the problem computer...

To find the problem computer is actually the easy part:
Next time your network slows to a crawl, unplug your computers from the network, one at a time, until the problem goes away. The last one disconnected SHOULD be your problem computer. If the problem does not go away until ALL computers are disconnected, start reconnecting your computers in the same order you disconnected them
If the problem starts back up BEFORE they are ALL reconnected, you have either discovered problem computer #2 or a problem ISP.

You really need to make sure that every computer is protected by current antivirus software, with definitions no more than a week old, personal firewall, such as Zonealarm Pro, and anti-spyware software, such as Webroot Spysweeper, with definitions updated at least weekly, and all the up-to-date Windows and Office security patches.
A full virus and spyware scan must be done on each computer at least once a week.

Bandwidth may not be the only thing your company is losing.

Nice work...

A worm is a viruslike code that can multiply via the Internet.

The cyber world is anxious to see if the "Conficker" Internet worm will unleash its wrath on the Internet today. But some computer-security experts anticipate it will be a non-event akin to Y2K. Computer users in recent weeks have braced for April 1, the date Conficker's creators designed the worm to contact rogue Web sites to infiltrate more computers. The worm targets computers running Microsoft Corp.'s Windows operating systems. Current estimates suggest the worm has infected between 3 million and 12 million
computers worldwide. A worm is a viruslike code that can multiply via the Internet, infecting multiple computers that lack protection software. It can turn off antivirus programs, block access to security Web sites and slow operating performance. Today, the worm is supposed to contact various sites that will tell it what to do next. It's unclear what the instructions will tell the worm to do, but some worry it could attack the sites of government agencies and financial institutions. Others predict the day's threat will turn out to be an April Fools' Day joke. Regardless, computer experts say simple steps can protect businesses and consumers against Conficker and other threats. "All the hype about (Conficker) can . . . . be solved by having up-to-date software," said Charles Fox, a unified communications specialist with Microsoft in Denver. Microsoft has security patches and tests to check for the Conficker worm available at www.microsoft.com/protect. Brett Rushton, vice president of network infrastructure and security for Tempe-based computer reseller Insight Enterprises Inc., urges people to think twice before downloading files. Researchers are concerned about Conficker more so than other Internet worms is because it can infect computers via file attachments, removable devices such as a thumb drive or MP3 player and guessing a computer's network passwords. Able Information Technologies Inc., a Chandler-based outsourcer of information-technology services, urged its clients to download the latest Windows security updates. The company also scanned its internal systems for suspicious activity.

Air France Aircraft Missing in Atlantic

An Air France plane disappeared over the Atlantic Ocean. Aircraft Airbus A330-200 is separated from the base Rio de Janeiro, Brazil on Sunday at 19:00 local time, scheduled landing in Charles de Gaulle Airport, Paris, Monday morning at 11:15. Aircraft flights numbered AF 447 that carry 228 people, consisting of 216 passengers and 12 crew. Brazilian Air Force has been revealed to search. A source said, the plane belonging to the French airline lost from radar approximately 300 km offshore Natal, Brazil. Air France official statement said, the plane most likely be struck by lightning. Mentioned, at 02:00 GMT, the plane that crosses a zone full of lightning shocks with a very strong turbulensi. According to Air France, on the plane at 02:15 to send the message automatically annunciate the occurrence of interference aircraft electrical circuits. Air France plane and lost on the Atlantic Ocean.