The location where, whatever program it is your installing, will be located.
No, you do not. You only install Active Directory if the system is going to be a domain controller. If it is a member server or a standalone server Active Directory should not be installed.
Install active directory on the server
Try installing this program to a different directory.
C:\(Username)\Downloads This should be correct on windows.
no you cannot install AD in Xp system but there is standalone ADAM which you can install on xp system which has few features of AD
DCPROMO Unattended Installation
yes it is and recommended also
printer virtual directory component
c:\winnt
Go to run and type dcpromo and follow the steps
Yes, when you install Active Directory you must also install DNS (if you haven't already done so). DNS will be consulted for name resolution but it doesn't have to be consulted for all network resources.
Most Linux distributions come with several PAM authentication modules, including modules that support authentication to an LDAP directory and authentication using Kerberos. You can use these modules to authenticate to Active Directory, but there are some significant limitations.