Stop installation Software

I have some remote users with laptops.  They keep messing them up with software.  Is there any good software out there to block, software installation.  The option to remove the users from local admin, is complicated because it causes issues with approved apps.   If that is the only route to go, fine.  But if some one knows some good software, it would help.
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There are products like
Fortres and
Deep Freeze 

This might point you in the right direction.

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have you tried to disable program instalations

Here's the fix...........start/run.........type: "gpedit.msc" .............OK............ Local Computer Policy/ computer configuration/ administrator templates/ windows components/ windows "disable windows installer".
Go into the group policy of each local machine and disable the windows installer.  
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