I tested this on my McAfee 8.0i installation with the following results that were correct for my computer.

Code:
:: GetAVVersion UDF ::
VirusScan Enterprise
DAT File Version: 4.0.4429
DAT File Date: 16 February 2005
Engine Version: 4.4.00
Product Version: 8.0.0.912
Support URL: https://mysupport.nai.com/redir/default.asp?pCode=VSE&sRef=app&sDest=FAQ
 === ePolicy Orchestrator was found ===
EPO Path: C:\Program Files\Network Associates\Common Framework
Process is complete


I would suggest that for McAfee users the ePO version would be significant. The version can be obtained by the following code.
Code:
  $key = "HKEY_LOCAL_MACHINE\SOFTWARE\Network Associates\ePolicy Orchestrator\Agent"

  $ePO = KeyExist($key)
  if $ePO
    $key = "HKEY_LOCAL_MACHINE\SOFTWARE\Network Associates\ePolicy Orchestrator\Application Plugins\EPOAGENT3000"
    $ePO = ReadValue($key, "Version")
    if @error=0
      WriteLog("ePO Version : " +$ePO)
    endif
  endif
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