Create a password protected administrative account that is capable of installing software but restricts the user's ability to create new user accounts

1) Use TweakUI to make "User Accounts" in "Classic View" control panel to disappear.
2) Force the control panel to show only "Classic View", because "Category View" will show the category, "User Accounts". Create a "ForceClassicControlPanel" DWORD value in the HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer registry. If "ForceClassicControlPanel" is set to 0 then the Category View is ON. If "ForceClassicControlPanel" is set to 1 then the Classic View is ON. Deleting the "ForceClassicControlPanel" value re-enables switching between views.