When the install creates the amandabackup user on Windows Vista Home Premium and maybe other versions, this has the annoying effect of adding the user to the list of users that can log in.

The solution would appear to be adding the following Key Path and vaue to the registry.

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\UserLis t]

I beleive this has the effect of telling windows logon that this account is a special account i.e. a service account.

It might be a good idea to get the installer to add this to help out.