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Question: how can i install this on a server OS

How can i use this scanner when the machine on which it is installed is locked by the user,by far this is the most useless scanner i have ever come across,i cannot install it on a server and when i installed it one window xp the user of that PC has to always log onto the PC before we can scan as the machine goes into sleep mode when you log off.

any ideas to overcome this?