If you searched around on the forums, I'm sure you have already seen this (from your description, that's basically what you did already):
http://forum.thegamecreators.com/?m=forum_view&t=118371&b=22&msg=1793748#m1793748
"C:\Documents and Settings" does exist. It is a hidden link (shortcut) to C:\users. It shows up if you use a file manager which is configured to show hidden files.
In your error message the path (if you copied it correctly) is shown as "C:\Documents and settings\Visual Studio 2008\Projects.....", but the path should be "C:\Documents and Settings\Manuel\My Documents\Visual Studio 2008\..." etc. if that's where you copied the files. If the path is wrong in the error message, there must still be a problem in the wizard (vsz) files.
I suggest that you check the corrected absolute paths in the wizard files again, maybe there was a typing mistake.
You don't need to change the paths in the "C:\Program Files (x86)\The Game Creators\Dark GDK\Wizards\Projects" directory where you copied the files from. Only in the directory where you copied them to, i.e. in the My Documents path. Make sure to modify the path in the vsz files which are under the "Wizards" directory. Maybe there are vsz files in the "Projects" directory as well but those seem to be not used.