What is csrss exe in windows 7

Something is running on my harddrive, it is constantly running. I am running windows 7 premium. These processes are running on my computer; csree.exe, atied.exe. ,dwm.exe, explorer.exe, rundll32.exe, and winlogon.exe. The cpu useage is at 30% Is this csrss.exe a virus? Today it shut down today and wouldn't boot up for over 2 hours. Help please!
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More about what csrss windows
  1. it can be either a genuine windows process located at C:\Windows\System32\csrss.exe

    or a trojan like Trojan.W32.Sober or W32.Netsky.AB worm

    download and run malwarebytes
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