How to silent uninstall 5.5 before installing 6 using AAMEE?

Hello -

We are a school moving from Master Collection 5.5 to Master Collection 6.  When I installed 5.5, I used the Adobe Application Manager, and I'll be doing the same for 6.  I'd like to uninstall 5.5 first to avoid any confusion by students/teachers, so there is only one version on the machine.  I'm deploying with a KBOX 1000, probably using using a file share.  Win 7 to several hundred machines.

In my KBOX managment utility, I found this for an uninstall command:

C:\Program Files\Common Files\Adobe\OOBE\PDApp\core\PDApp.exe --appletID="DWA_UI" --appletVersion="1.0" --mode="Uninstall" --mediaSignature="{D57FC112-312E-4D70-860F-2DB8FB6858F0}"

I found this to work, except it's not silent.  It brings up a screen where I have to press Uninstall.

I need a silent uninstaller, so I can run the 5.5 uninstaller, then run my 6 installer, all within a couple of nice and tidy batch files that I can push out.

Any ideas?

Thanks!

Carl Sundermann