unable to locate winconfig for windows 7?

I want to close or completely disable some unwanted programs that repeatedly load when my system boots. But the problem is that I am not able to locate msconfig or winconfig in Win 7 which is running on 64 bit version? I could not find it in system32 folder either. So help me in locating this folder so that I can make system boot a clean process.
Nov 5 2011
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