can not run sfc.exe in c++

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C++

hi I want to run sfc.exe command in c++.
I use this code:

/*
Run Command with user permission
 */
HINSTANCE SFCSevenRun() {
	return ShellExecute(NULL, "runas", "C:\\WINDOWS\\system32\\cmd.exe",
		"/k C:\\WINDOWS\\system32\\sfc.exe /scannow", 0, SW_SHOWNORMAL);
}

/*
Run Command without user permission
 */
HINSTANCE SFCXpRun() {
	return ShellExecute(NULL, "open", "C:\\WINDOWS\\system32\\cmd.exe",
		"/k C:\\WINDOWS\\system32\\sfc.exe /scannow", 0, SW_SHOWNORMAL);
}

If I run cmd in usual mode (use open instead of runas ) I get this message:

"You must be an administrator running a console session in order to use the sfc utility."

In xp it is OK, but in windows 7 I receive this message in cmd when I run as admin:

"windows resource protection could not start the repair service"

Please Help me. How can I fix this problem?