Complete Uninstall of Norton AntiVirus and install of McAfee VirusScan for 250 users

I am on a network of about 250 users connected to a domain. These workstations are running norton antivirus version 10.1.6 and connect to a norton antivirus server for definitions. On the server I have Symantec System Center running. What I am trying to do is uninstall norton antivirus and install mcafee virusscan. I have already installed the epolicy orchestrator on another server. I have also attempted to push out the epolicy agent to the workstations but most of them have not received the agent. My questions are:

1. What and how is the best way to uninstall norton antivirus succesfully from all the machines? I have heard of nonav but I am unable to figure out how to deploy this to multiple users.
2. What is the best way to deploy the new antivirus program? Is there an msi that I can create for the epolicy agent? Can I then push out the actual virusscan software?

Thanks in advance.
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About unInstalling the norton antiviurs .. I dunno . I think ununstall policy works only if u use it to install the software. But, you can check the commandlines for the antivirus so that you can write a script.

To install the McCaffe:
Make a group policy. go to the software policy , make a new software policy to assign the software to your users. Make sure the msi package is in a network share with appropriate permission.
vmamedovAuthor Commented:
symantec was able to provide cleanwipe and nonav software to perform the mass uninstall.

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