How do i restrict who can log in

Greetings and thank you for reading.

Background: I'm the network assistant administrator, I manage a single domain using Windows Server 2008 R2  with 150 users and about 120 machines. I am the ONLY IT individual on site. Last year, we installed two xp machines in our lecture hall to be used for Powerpoint presentations.  We created an User account named "Projector" and informed staff to use that log in.  Staff continues to use their own credentials to log in and get frustrated when they realize they are missing items.

Management has requested that all user accounts, other than "Projector" and "Administrator", be removed from the machine so that ONLY "Projector" or "Administer" can log in it.

I have asked for help with other sources who suggest that I modify the User account and just exclude the select machines from being able to "logon" screen.  Problem is, the user needs to have rights to be able to log into any OTHER machine, just not the Projector.  Besides, I really don't want to modify 120 users, adding machines that I "think" they'll need access to.  

I know there has to be a way in Group Policy to manage this, but I'm very new at this.

I hope I asked the question correctly.  Simple question is: "How do I restrict who can log on to a specific computer?"

Thank you.
James DartAsked:
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Rich RumbleSecurity SamuraiCommented:
Use the Groups to only included the ones you want.
http://technet.microsoft.com/en-us/library/ms175588%28v=sql.105%29.aspx
Open secpol.msc and go to, Local Policies -> user rights assignment and you will see quite a few "Deny log on" entries. Modify those, or just use the "Access this computer from the network" setting to include the groups you want.
-rich
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btanExec ConsultantCommented:
As shared by richrumble, there is the  "Deny log on locally" setting, but thought that this for restrictions for local machine. You can catch this as well http://mintywhite.com/windows-7/7maintenance/prevent-users-logging-domain-workstations/

But note that it only work for specific groups of users to specific groups of computers. If you want to restrict a random set of users to that specific computer, you may want to look at the Logon to option under that user account. so may consider to create a new policy such as "restrict logon" and edit the new policy
e.g. goto Computer Configuration > Policies > Window Settings > Security Settings > Local Policies > User Rights Assignment
e.g. Open the Deny log on locally policy and add the group for your Users
e.g. Close and save the policy
e.g. Attach the new policy to the computer

There is a product called UserLock that allows you more granularity, you can check out http://www.isdecisions.com/products/userlock/features.htm

Maybe a graceful scale up of the solution in future where you can explore some of the lockdown can factor in access based on workstations, time, business hours, and connection type.
e.g. own workstation, IP range, department, floor or building.
e.g. working hours and/or maximum session time for protected users.
e.g. Outside of allowed timeframes and/or when time is up, users will be disconnected with prior warning.
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James DartAuthor Commented:
That is what I just found. Excellent.  Thank you for confirming my research!
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