How to totally remove pirrit suggestor? (its killing me)

How do i totally remove pirrit suggestor? I don't remember visiting malicious website or downloading maclicious software into my computer and i'm having this green icon that revealed that my computer is infected with the adware called pirrit suggestor. When i checked my task manager, i found out unusual program names in my computer as shown in the screenshot below

I've tried various method like downloading pirrit removal software but it didn't work.

I need help because its slowing my computer down and i know pirrit is infamous for stealing confidential data in my computer.

Thank you.

This link seems to suggest that normal removal methods may work (manage add-ins window of browser, Windows uninstall a program): Looks like they might be selling something, also.

Sounds like you've tried some stuff. Did you start with the basics (normal uninstall and malware scan with your AV program)?

This link also mentions basic Windows uninstall, plus Malwarebytes and CCleaner, and describes some manual methods:

This link contains some specifics about the files that might help in a manual search and removal:
Also check here: Installation Path C:\Program Files\Rapider\pirrit.exe
If you do find the pirrit executables, just delete them.

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