You have different possibilities to record your voice:

A. Using microsoft audio recorder. Follow these steps:

          1. Inicio → todos los programas → accesiorios → entretenimiento →  grabadora de sonidos

(you may need to get a microphone for your PC. Laptops already have a microphone incorporated)

          2. Save the file

          3. Send it to me as an attachment via e-mail

B. Using Audacity (it is an audio editor). You can download it for free at: http://audacity.programas-gratis.net/

            1. Download the program

            2. Record your voice

            3. Save the file

            4. Send it to me as an attachment via e-mail