[Dev-C++] What is wrong with this code?

#include <iostream>
#include <windows.h>

using namespace std;

int main()
{
    system("c:\PTH.exe");
    sleep<15000>;
    system("c:\BLACK.exe");
    return 0;
}

returns the error upon compile:

c:\documents and settings\\my
documents\\projects\shutdown\shutdown\cpp.cpp(8) : warning C4129: 'P' :
unrecognized character escape sequence
c:\documents and settings\\my
documents\\projects\shutdown\shutdown\cpp.cpp(9) : error C2065: 'sleep' :
undeclared identifier
c:\documents and settings\\my
documents\\projects\shutdown\shutdown\cpp.cpp(9) : error C2059: syntax error
: ';'
c:\documents and settings\\my
documents\\projects\shutdown\shutdown\cpp.cpp(10) : warning C4129: 'B' :
unrecognized character escape sequence