How to block a toolbar from getting installed.

Today while installing an exe a IE Toolbar software (Viewpoint Software)which was bundled into it got also installed. After that when he opened the IE browser it was hanging up, became very slow and even crashed the browser many times.

My question here is can there be any process to stop this kind of toolbar to get installed with other software package? Can we have some Group policy which can help me to stop this trouble.

Thanks