My mouse on the pc moved by itself and went to google chrome and paypal and then to log in

I just thought I don't see right

there was no mouse connected and I only saw it from a distance (have a laptop)

someone just wanted to hack my paypal account even though I don't have one?

Yes, I've had it before. Disconnect from the Wi-Fi and go to task manager, there you end the dllinjector.exe process

Disconnect the computer from the Internet, reset to factory settings and change all passwords!

Then you've probably downloaded too much new RAM.

There's nobody but before that there was an injector which I have already finished but no longer know what its name was

Disconnect from the Internet and look in the task manager for dubious tasks like dllinjector.exe and other things with inject.

As

Isn't there anymore but was before

I've already taken it away

Download 128GB new RAM now?

See if your antivirus program finds something.

I already have everything clean

So, "moves by itself" is not! You can also control a mouse pointer from another computer!

Disconnect the computer from the Internet, set up the PC from scratch (yes, that is a lot of work, but it is safe!) And secure your router better! Change your passwords and never use the same password for different services!

Maybe he has already removed everything because that was 30 minutes ago

I have 10 TB now; )