Csrss.exe problems

I was trying to turn off my computer and it wouldn't let me shut it down, so I tried to open my task manager and it wouldn't let me until I opened it with run. When I got into my task manager I saw some processes called csrss.exe which I read could be a trojan, and winlogin.exe and they weren't being ran from my user. I know these processes are natural windows processes, but I think they are some viruses disguised as those processes. When I tried to open file location it wouldn't let me, and they were still there after I did a virus scan, and malwarebytes scan. Also it seems they have affected my browsing speed where it is almost unbareable..Also it seemed to seperate my internet into 5 different processes in the task manager, which is weird.

Ok, I thought that might be the case. When I tried to open them in safe mode it worked, so that makes sense. My PC run speed is another issue I guess, I'll post about it in some other area if the issue persists. Thanks for the reply.