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Step 1 if only if you have had installed any of those security programs. You have there the instructions and the tool for each program so that you can uninstall them thoroughly. For example, you said before that Norton was installed accidentally. Also you explained that you uninstalled it through “Add and remove programs” so to make sure that no left over remains, you should run [26a]. This is the link for Norton removal Tool:
ftp://ftp.symantec.com/public/english_us_canada/removal_tools/Norton_Removal_Tool.exe
About Chrome. During installation or afterwards when you reboot the Avast! installation, it will show a window with the options to install Google Chrome as your default browser, and tool bar. see image Since you already have it, the window might offer Google Drive, either way just untick the little boxes that way you can not go wrong.
Any other question you are not sure, be free to ask. Read the instruction for aswclear. It is essential to run it for Avast! 6 and 7 if you had them installed before, and then you run aswclear for Avast! 8.