Firewall

I was with a client this week whose computer - a new-ish one running Windows XP - was running really, really slowly. I ran a full scan of her virus guard which did pick up one virus but this made only marginal difference to the speed of the machine. Then I ran a programme that looks for other nasties like spyware and such things...

It came up with 384 nasties! Fortunately, the software also got rid of them. But that's not all.

To stop too many more of these nasties getting onto this computer I l…