windows scheduling

Question

Hi,

       I do have a windows service created to check against the logic and to schedule alerts. But now the email messages being received are not in html format. Now i would like to make changes to the existing windows service and would like to deploy it into the server. If so i got following 2 questions.

a.) is there a way to change the existing windowsservice.cs page
b.) can someone help me with step by step instruction to deploy into the server and over write the same existing application so that the new services kicks in and does exactly as needed.

thanks