I did the same thing a while ago and my INI file looks like this...
Code:
[Package]
Description=Windows XP Security Update KB971029
Version=1.0.0.0
OS=5.1.2WS,5.1.3WS
ExeFile=WindowsXP-KB971029-x86-ENU.exe
UninstallExeFile=C:\Windows\$NTUninstallKB971029$\Spuninst\spuninst.exe
Addcommand= /passive /quiet /norestart
UninstallCommand= /passive /quiet /norestart
reboots=1
Like you, we had an autorun-style virus that RMVP4 didn't detect, so I logged a call with RM and they submitted it to Symantec on our behalf, since they have an enterprise support agreement with them. A day or so after we did this, I found VP4 detected the virus.