Potentially unwanted software keeps coming back

Initial symptoms:
a) Firefox started trying to open "file:///C:/ProgramData/Airstrongs/snp.sc" on startup
b) Target on firefox shortcut changed to '"C:\Program Files (x86)\Mozilla Firefox\firefox.exe" %SNF%'
c) "findit" installed as a one-click search engine
d) Some websites started showing ads "Powered by SafeFinder"
e) There is a process "Airstrong.exe" running at all times

Same issues as initial keep coming back even after using multiple anti-malware programs

Used:
Malwarebytes...

Potentially unwanted software keeps coming back