You need to install the Microsoft Windows sysprep files on the Virtual Center server for each operating system that you are trying to customize.
With the new version of Virtual Center, 2.5, you need to make sure you have all of hte updated sysprep files installed. You can obtain them from Microsoft by searching Windows <OS version> sysprep
Also in that document, things changed with the newer versions of VC. You need to create a folder for each OS version:
Name: xp, svr2003, svr2003-64
Then put the sysprep files in there. If they are working out of the 1.1 directory it will not work.
I have them in the XP directory. Still no go.
Try restarting the VC service. I'm not saying this will work, but it's worth a shot.
Which XP sysprep files did you place in the directory? I remember having trouble with this and I ended up extracting the contents of the XP deploy.cab into the XP directory. I haven't had a problem since.
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Deloy.cab didn't work, nor did a restart. I am calling platinum support.