You want to check the back of your PC ... you should have a switch near the power plug to switch from 110v to 220v. Slap on an adapter and you should be fine.

I wonder if it may even be possible to buy a new power cord (to run from the PC's powersupply to the wall) and therefore eliminate the need for an adapter.

I hope my Wii is as easy to use in NZ ... 8-)