Unchecky aims to keep potentially unwanted programs out of your computer.Its primary feature is automatic unchecking of unrelated offers, such as potentially unwanted programs, offers to change your homepage or your search engine. With it these offers become opt-in instead of opt-out, i.e. they will be installed only if you explicitly choose you want them (you usually don't).Another important feature is that it warns when you accept a potentially unwanted offer. Installers often provide them as a natural part of the installation, so they can easily be accepted by mistake. Use it and it's less likely to accept such offers accidentally.