How do I get rid of the trojan csrss.exe?

it's making my computer go slow it's using up my memory and my superantispyware, avg or spybot can't detected it even though it's in my system*2 folder and it's showing on my windows task manager

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csrss.exe is supposed to be running in system*2. If it is anywhere else, it is malware

i have use latest version of * anti virus even though the autorun.exe virus is not remove
please help me