To prevent installation of programs from one user on your computer, it is necessary that each had their own account. For this you need to go to the Windows control Panel by clicking the start menu and find the appropriate section. In control Panel you should Enter the menu "user Accounts", then select "Manage another account" and click "create an account".
By creating an account the user, who will not be able to install and remove programs, you should select the account type as "standard". In this case, the user will not be able to make significant changes to the operating system's settings and will not be able to control the installation.
The process of account creation will be completed by clicking on "create an account" then you can edit your account by setting a password. Thus you will protect yourself from unauthorized installation of software on the computer by any user except you.