How do I disable the avast! Mail Scanner on my Exchange 2003 Server

When I try to disable it I get access denied even logged in as administrator. This service is causing problems with sending outbound email to some of our customers.

I figured it out. I went into add/remove programs and did a change install and removed the mail scanning features from the client on the server.

my computer was install avast 4.8 1335,but before i click setup,the program can not let me in because the program want password? :cry: