Learn to read the install instructions
Why can't people just do what you should do, when you install something NEVER select the standard install options, always select the custom option to see what crapware they are trying to install as well.
Long gone are the days where you were given the option to install the Google toolbar as an added option, if you don't do the install properly then you get all the crap for free.
And that isn't just for free/shareware, some paid for software has been known to side install 3rd party junk as well.