As I noted earlier, so far the worm has not caused any damage, except for giving scareware makers another way of cheating people out of their money, and well meaning friends sending annoying email warnings. But the worm is set to check with its masters on April 1st. If it downloads new instructions then, it could become nasty.
If you are already infected, get your anti-virus to run a pre-Windows start-up scan.
If you are not infected, and way less than 1% of computers are, just make sure you have all Windows updates, and that your anti-virus software is up to date, and you will have nothing to worry about.