It is imperative that you read what you click on the computer , especially if you are installing software.
I recently had to reinstall Foxit Reader on a computer when the following screen was shown as part of the installation process.
Well I did not want any of that and neither should you , so un-click all of them.
If you are installing the Adobe Reader you will be asked if you want to install a McAfee add in.
Just because the screens appear does not mean you have to accept the installation of the additional software and the problems that will come with installing these on your system , installing without these is the desirable outcome.
It's just like signing a contract , read the fine print before you commit because the consequences may come back to haunt you in the form of toolbars appearing.