We got hit by this Klezworm a couple of weeks back, and it was pain in the neck. I downloaded Grisoft's AVG progra,mme, which wiped out the virus (plus another one which piggy-backs along with it), but then had to sort out the mess it had caused. It seems to infect programmes rather than delete data, and took out a lot of our more useful ones. I am still in the process of re-installing working copies.