Before I got into Software stuff I did a decade+ of computer help desk stuff/Network Admin stuff/Network Engineering stuff so it’s kind of like breathing to me if you know what I mean. 
Yep, your Profile/Profiles will be contaminated, your Registry and some other areas of your computer, but if you manually remove the offending crap from your Profile/Profiles then that will normally stop whatever is occurring so that you can move forward with the rest of the crap cleanup.
Make sure your Browser is closed/shutdown. You want to manually delete everything that is in these folders first so that something is not automatically reinstalled again while you are doing cleanup (Windows 7 – other OS systems are similar):
Users\[your admin profile name]\AppData\Local\Microsoft\Windows\Temporary Internet Files\
Users\[your admin profile name]\AppData\Local\Temp\
Then look through all of your Profiles: Local, LocalLow and Roaming for anything that looks like it should not be there. If you have doubts then Google it.
When in doubt rename a folder before you delete it. I like to rename folders with an underscore, which moves the folder up to the top of the directory/folder list. Makes it easier to keep track of what you are doing. Example: Superfish renamed to _Superfish.
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