Cannot install punk buster (getting kicked from servers)

I was playing RO2 yesterday without any problems, even on PB servers. But today, suddenly, I cannot play on any PB enabled servers because I get kicked after like a minute, with a message:



Punkbuster Kicked

You have been kicked by Punkbuster for: Punkbuster kicked player 'Hyperion' (for 0 minutes) ... RESTRICTION: Service communication failure: PnkBstrB.exe initialization failed



My PnkBstrA.exe is running well, in the task manager, but the B one is nowhere to be found even in administrative tools -> services. After downloading the punkbuster service setup from their website, I get an error message:



Pbsvc Error

can't open file 'C:\Windows\system32\PnkBstrB.exe' (error 32: process cannot gain access to the file, because another process is currently ussing it.)

(roughly translated)



I have no antivirus installed so it shouldn't be a problem, even the Windows defender isn't working for me. So how can I fix the PnkBstrB.exe? I cannot find it anyone on the internet, as everyone is having problems with the A one...