Computer slowdown due to "bad" csrss file

Lately my computer has been running very slowly. I looked at my processes and saw there were two csrss.exe processes, I looked online to see what that meant and found out that one was a virus that my McAffee wasn't picking up. Turns out there were 3 csrss.exe files, two of which were fake. I manually deleted one but the other one refuses to go, even KillBox couldn't get rid of it.

Anyway I did the entire malware scan cleanup stuff for Vista, but that file (which I managed to rename to "WTF" out of frustration and move to my C: drive where I can find it easily) is still there, I still have two csrss.exe processes, and my computer still runs slowly. I've attached the required logs here, can someone help me with this?

 

Here's the last log from ComboFix

 

Re: Computer slowdown

OK thanks for clearing that up. I ran the Norton removal tool and I am still getting slowdowns.

My computer isn't slow booting up or shutting down, the only time this problem is noticable is when I'm running a game or some other program that uses a lot of my processing speed. Half the time it runs perfectly fine, and then over about half a minute it gradually becomes slower and slower until I pretty much can't do anything, and then bam it goes back to normal for about 30 more seconds before slowing down again, it is driving me nuts. I was certain that malware was the problem as I have never heard of any normal computer process that acts like this. And when I look at my processes during the slowdown everything seems perfectly normal, in fact the processes show the exact same memory usage when everything is running as it should vs when everything slows to a crawl 30 seconds later.