"PfCreateInterface" It does not work on Windows7-64bit ?

if ((dwLastErrorCode = PfCreateInterface(
      1, 
      PF_ACTION_FORWARD, 
      PF_ACTION_FORWARD, 
      FALSE,
      TRUE,
      &hInterface )) != NO_ERROR) 
 {
 
      return ; (<<-- stop here)
 
 }

Hi,
 
I tried compiling as noted above to block or allow the packets on Win7-64bit .
But It does stop with no error .
 
Any ideas on how to solve it ?
 
Kindly help me.