Hi norbel, sorry to hear you had problems with the hard drive. There are some cases where an electric surge can damage USB connected devices to your PC. For your case I recommend you to go directly to the WD support page and create the replacement order. You can also contact WD support and they can create it for you. Click on the following links for more information.
How to get an RMA, (Return Merchandise Authorization) or replace a defective product under warranty
Service & Support
http://support.wdc.com/country/index.asp
