I found this news item today which clearly shows that surfing the net with an unprotected PC can be extremely dangerous -

“There is now a 50% chance of being infected by an internet worm within just 12 minutes of being online using an unprotected, unpatched Windows PC”, according to Sophos, one of the big anti-virus companies. That’s how bad it has become. Even the U.S. Computer Emergency Readiness team says “the average time-to-exploitation … for an unprotected computer is measured in minutes.”

A recent study found that over 90% of computers are infected by some type of malware picked up from internet usage.

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