Virtual PC 2007 - set up a shared folder between virtual machine and host?

I am still having ONE small issue. I got the additions installed, but it is still not allowing me to set up a shared folder between the virtual machine and the host system. It's saying "Not installed." Here, I'll give you a screenshot of the issue I'm getting.

Hi,

Start your virtual machine & install the additions pack under "Action"

That's the thing is, I already installed it.. Twice, actually.
I've tried this on all of my VMs. 95, 98, 2000, XP, Vista, even on a Windows 7 VM. None of them have worked.

Hi,

Run the network wizard "Setup a home or small office network" on the virtual PC.


You will then be able to access the running virtual pc shared folders from the real PC network in explorer.