Dear Mr. Wilder,
I am writing to you today because I know my experience and training make me the best choice for your Desktop Support Technician position that I saw advertised on your company website. For this reason, I have included my resume.
My training, five years experience, and track record as a Desktop Support Technician make me an excellent choice for your open position. In reviewing my resume, you will see that I gained considerable experience in maintenance, installation, and troubleshooting for a wide variety of desktop software, applications, and programs. I am a great asset as I can not only understand and work with highly complicated systems; but I can also explain these topics and terms to people who are not technically inclined. Furthermore, I stay abreast of all the latest in IT developments and advancements; and can suggest the right additions and updates as they might apply.
I know it would be mutually beneficial if we met to discuss this position, and ask that you contact me at (555)-555-5555. Thank you.