Restrict users from installing software with Windows 2011 SBS Policies

I have a Windows 2011 SBS server, for the first time, we are going to format every computer in the office and add them to the domain, every computer with their corresponding user..

We are doing this so we can protect our company restricting users to install illegal software, how can I restrict users from installing software?, every user was created using the add user wizard on sbs 2011, as a normal user...

I cannot manage to understand 100% the group policies, and how to give some users different policies.

can someone help me?
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Natty GregIn Theory (IT)Commented:
Create user groups and create policies per group, instead of per user policy.
then you can put each user in their respective group. each user can be be a part of mutiple groups.
however if you do not want a particular user to install anything then make his primary group the one with the restrict install (anything) then make him/her a member of any other group you  wish
marpanetAuthor Commented:
I needdd help!!!!!
I just added on the restricted group the Administrator group as I found out on a webpage!! Now I can´t log in via RDC not even locally,  "You cannot log on because the logon method you are using is not allowed on this computer", what can I do???? I cannot get inside my server!!!! :´´´(
Natty GregIn Theory (IT)Commented:
ok thats a rap unless someone else have an in site other than that you have to reinstall the server.
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Natty GregIn Theory (IT)Commented:
Next time you want to secure the admin from any attack, change the name from admin to something else that you'll remember, never put admin in restricted group, however i fail to see how you put it there without the server barking at you if you're sure.
marpanetAuthor Commented:
The admin user is not Admin, it{s another name, putting the group in restricted group caused my user to not been able to log to anything????

I can manage to enter Windows only in the Active Directory Restore Mode, but from there, I don´t know how to restore to default as it was...  what can I do??
Cris HannaCommented:
You are going to have to restore the SBS server back to before you made this change.

if your user accounts are already created in the SBS console, make sure it shows them as Standard users.  standard users cant install software   DON'T make the SBS administrator account a standard user.

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marpanetAuthor Commented:
Sorry for the delay, I had to reinstall the server because there was no other option...
I followed both solutions and both worked.

Thanks to all..
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