you have to have multiple install directories for dual log to work, what I usually do is make Directory called 2 inside the one that already has your AC install. Then I copy the launcher into it (repeat for any additional installs you want). Then you have add them to your paths, every ac install you wan to be able to use needs to be added. Once you have the paths added, then it's time to have ACDC copy all the other needed files into the new directories.
At this point you should be able to dual log as long as you have multiple accts :^)
I know jack about Vista but know you need to install Decal 'For Everyone' not just the admin acct or change it to be able to run as admin. Also you'll probably need to DL and install both the .NET 1.1 *AND* 2.x frameworks....
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Edits are for spelling :^)
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/a Devil's Saint says, "what we teach our Children we become" June 3, 2008