Is there a program that automatically declines to install toolbars/other junkware when installing stuff? Similar to how ninite.com does with certain programs? That seems to be a big issue my not-so-computer literate family is having
First, reformat your system. Trust me, it's worth it at this point.
Second, if your whole family is using one computer, allow yourself to be the administrator and restrict their access (no installations without permission). This way, they'll get pissed at you and want you to let them install their program. When you find out the program they want to install is SuprVidjo3!! to watch free episodes of Spongebob, you can educate them on why viruses are poop.